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+\documentclass[DIV10]{cnpkgdoc}
+\docsetup{
+ pkg = mychemistry,
+ title = mychemistry -- examples,
+ subtitle = Create Reaction Schemes with \LaTeXe\ and Chemfig ,
+ code-box = {
+ skipbelow = .5\baselineskip plus .5ex minus .5ex ,
+ skipabove = .5\baselineskip plus .5ex minus .5ex ,
+ roundcorner = 3pt ,
+ innerleftmargin = 1.5em ,
+ innerrightmargin = 1.5em
+ }
+}
+
+\addcmds{
+ @addtoreset,
+ anywhere,
+ arrow,
+ branch,
+ celsius,
+ ch,
+ chemabove,
+ chemand,
+ chembelow,
+ chemfig,
+ chemname,
+ cmpd,
+ colorlet,
+ command,
+ draw,
+ elmove,
+ floatstyle,
+ fpch,
+ fplus,
+ fscrm,
+ fscrp,
+ Hpl,
+ iupac,
+ lewis,
+ Lewis,
+ listof,
+ makeinvisible,
+ makevisible,
+ marrow,
+ mch,
+ mCsetup,
+ mech,
+ mesomeric,
+ N,
+ node,
+ para,
+ pch,
+ phantom,
+ reactant,
+ restylefloat,
+ setarrowlabel,
+ setarrowlength,
+ setarrowline,
+ setatomsep,
+ setatomsize,
+ setbondlength,
+ setbondshape,
+ setcrambond,
+ setmergelength,
+ setrcndist,
+ setrxnalign,
+ setschemealign,
+ setschemename,
+ SI,
+ text,
+ therxnscheme,
+ tikzset,
+ trans,
+ transition
+}
+
+\chemsetup[option]{circled=all}
+
+\usepackage{chemnum}
+\usepackage{fnpct}
+\usepackage{booktabs}
+\usepackage{siunitx}
+\usepackage{scrhack}
+
+\TitlePicture{%
+ \parbox{.7\linewidth}{%
+ Since the documentation is already long enough I decided to provide an
+ extra file containing only examples and a few words where to find possibly
+ interesting code.\par
+ For all the undocumented little macros like \cmd{fscrp} or \cmd{delm} have
+ a look in the \paket*{chemmacros} documentation.
+ }
+}
+
+\begin{document}
+
+\section{Addition Reaction}\label{sec:addition}
+A simple reaction scheme with two different products.
+
+\begin{rxnscheme}{Addition Reaction}
+ \reactant{ \chemfig{=_[::-30]-[::60](=[::60]O)-[::-60]} }
+ \arrow{ $+ \Hpl$ }{}
+ \mesomeric[,rf]{
+ \reactant{ \chemfig{=_[:-30]-[::60](-[::60]OH)(-[::-120,.3,,,white]\fplus)-[::-60]} }
+ \marrow[below]
+ \reactant[below]{ \chemfig{\fplus-[6,.3,,,white]-[:-30]=_[::60](-[::60]OH)-[::-60]} }
+ }
+ \branch[right=of rf,,yshift=3em]{
+ \arrow{}{}
+ \reactant{ \chemname{\chemfig{=_[:-30]-[::60](-[::60]OH)(-[::-120]R)-[::-60]}}{1,2-adduct} }
+ }
+ \branch[right=of rf,,yshift=-5em]{
+ \arrow{}{}
+ \reactant{ \chemname{\chemfig{R-[6]-[:-30]=_[::60](-[::60]OH)-[::-60]}}{1,4-adduct} }
+ }
+\end{rxnscheme}
+
+
+\begin{beispiel}[code only]
+ \begin{rxnscheme}[,]{Addition Reaction}
+ \reactant{ \chemfig{=_[::-30]-[::60](=[::60]O)-[::-60]} }
+ \arrow{ $+ \Hpl$ }{}
+ \mesomeric[,rf]{
+ \reactant{ \chemfig{=_[:-30]-[::60](-[::60]OH)(-[::-120,.3,,,white]\fplus)-[::-60]} }
+ \marrow[below]
+ \reactant[below]{ \chemfig{\fplus-[6,.3,,,white]-[:-30]=_[::60](-[::60]OH)-[::-60]} }
+ }
+ \branch[right=of rf,,yshift=3em]{
+ \arrow{}{}
+ \reactant{ \chemname{\chemfig{=_[:-30]-[::60](-[::60]OH)(-[::-120]R)-[::-60]}}{1,2-adduct} }
+ }
+ \branch[right=of rf,,yshift=-5em]{
+ \arrow{}{}
+ \reactant{ \chemname{\chemfig{R-[6]-[:-30]=_[::60](-[::60]OH)-[::-60]}}{1,4-adduct} }
+ }
+ \end{rxnscheme}
+\end{beispiel}
+
+\section{Mesomerism}
+\begin{rxnscheme}[,,,.8]{Mesomerism}
+ \setatomsep{1.6em}
+ \reactant[,start]{ \chemname{\chemfig{*6(-=-=(-[,,,,white]\phantom{Br})-=)}}{benzene \cmpd{benzene}} }
+ \arrow[,,2.8]{}{}
+ \reactant{ \chemname{\chemfig{*6(-=-=(-Br)-=)}}{bromobenzene \cmpd{bromobenzene}} }
+ \arrow[start.below,,,pfeil_a]{\ch{Br2} / \ch{AlBr3}}{$-\ch{AlBr4-}$}
+ \mesomeric[pfeil_a.below,mesomerism,xshift=8.5em,yshift=-2.5em]{
+ \reactant{
+ \chemfig{*6(=[@{e1}]-=-(-[:120]Br)(-[:60]H)-(-[:-30,.4,,,white]\fplus)-[@{e2}])}
+ \elmove{e1}{60:4mm}{e2}{0:4mm}
+ }
+ \marrow
+ \reactant{
+ \chemfig{*6(-(-[:90,.4,,,white]\fplus)-[@{e4}]=[@{e3}]-(-[:120]Br)(-[:60]H)-=)}
+ \elmove{e3}{180:4mm}{e4}{150:4mm}
+ }
+ \marrow
+ \reactant{
+ \chemfig{*6(-=-(-[:-150,.4,,,white]\fplus)-(-[:120]Br)(-[:60]H)-=)}
+ }
+ }
+ \branch[above=of mesomerism,,xshift=7.5em]{
+ \arrow[above]{$-\Hpl$}{}
+ }
+\end{rxnscheme}
+
+If you put something relative to an arrow you might have to consider that the
+arrow's anchor point is in the middle of the arrow. That's why \cmd{mesomeric}
+is shifted with \code{yshift=-2.5em} in line 9.
+\begin{beispiel}[code only]
+ \begin{rxnscheme}[,,,.8]{Mesomerism}
+ \setatomsep{1.6em}
+ % main reaction:
+ \reactant[,start]{ \chemname{\chemfig{*6(-=-=(-[,,,,white]\phantom{Br})-=)}}{benzene \cmpd{benzene}} }
+ \arrow[,,2.8]{}{}
+ \reactant{ \chemname{\chemfig{*6(-=-=(-Br)-=)}}{bromobenzene \cmpd{bromobenzene}} }
+ % branch:
+ \arrow[start.below,,,pfeil_a]{\ch{Br2} / \ch{AlBr3}}{$-\ch{AlBr4-}$}
+ \mesomeric[!!pfeil_a.below!!,mesomerism,xshift=8.5em,!!yshift=-2.5em!!]{
+ \reactant{
+ \chemfig{*6(=[@{e1}]-=-(-[:120]Br)(-[:60]H)-(-[:-30,.4,,,white]\fplus)-[@{e2}])}
+ \elmove{e1}{60:4mm}{e2}{0:4mm}
+ }
+ \marrow
+ \reactant{
+ \chemfig{*6(-(-[:90,.4,,,white]\fplus)-[@{e4}]=[@{e3}]-(-[:120]Br)(-[:60]H)-=)}
+ \elmove{e3}{180:4mm}{e4}{150:4mm}
+ }
+ \marrow
+ \reactant{
+ \chemfig{*6(-=-(-[:-150,.4,,,white]\fplus)-(-[:120]Br)(-[:60]H)-=)}
+ }
+ }
+ % last arrow inside a branch, since it cannot be shifted by itself:
+ \branch[above=of mesomerism,,xshift=7.5em]{
+ \arrow[above]{$-\Hpl$}{}
+ }
+ \end{rxnscheme}
+\end{beispiel}
+
+\section{The Former Titlepage}
+This scheme used to be on the title page of the examples file. It isn't any more
+but here's the scheme, anyway.
+\begin{rxnscheme}[,,,.7]{The Titlepage}
+ \setatomsep{1.5em}\footnotesize
+ \reactant[,a]{ \chemfig{C(-[4]*6(=-=-=-))(-[2]*6(=-=-=-))(-[6,,,2]HO)-C(-[2]CH_3)(-[6]OH)-CH_3} }
+ \arrow[a.20]{}{}
+ \reactant[20]{ \chemfig{C(-[4]*6(=-=-=-))(-[2]*6(=-=-=-))(-[@{e1}6,,,2]H_2@{e2}\chembelow{O}{\fplus})-C(-[2]CH_3)(-[6]OH)-CH_3}\elmove{e1}{10:4mm}{e2}{-10:4mm} }
+ \arrow[,,1.42]{$-\ch{H2O}$}{}
+ \reactant{ \chemfig{\chembelow{C}{\fplus}(-[4]*6(=-=-=-))(-[2]*6(=-=-=-))-C(-[2]CH_3)(-[6]OH)-CH_3} }{}
+ \arrow[a.-20,-|>]{}{}
+ \reactant[-20]{ \chemfig{C(-[4]*6(=-=-=-))(-[2]*6(=-=-=-))(-[6,,,2]HO)-C(-[2]CH_3)(-[@{e3}6]@{e4}\chembelow{O}{\fplus}H_2)-CH_3}\elmove{e3}{170:4mm}{e4}{-170:4mm} }
+ \arrow[,,1.42]{$-\ch{H2O}$}{}
+ \reactant[,end]{ \chemfig{C(-[4]*6(=-=-=-))(-[2]*6(=-=-=-))(-[6,,,2]HO)-\chembelow{C}{\fplus}(-[2]CH_3)-CH_3} }
+ \anywhere{below=of end}{}
+\end{rxnscheme}
+
+\begin{beispiel}[code only]
+ \begin{rxn}[,.7]
+ \setatomsep{1.5em}\footnotesize
+ % reaction above:
+ \reactant[,a]{ \chemfig{C(-[4]*6(=-=-=-))(-[2]*6(=-=-=-))(-[6,,,2]HO)-C(-[2]CH_3)(-[6]OH)-CH_3} }
+ \arrow[a.45]{}{}
+ \reactant[45]{ \chemfig{C(-[4]*6(=-=-=-))(-[2]*6(=-=-=-))(-[@{e1}6,,,2]H_2@{e2}\chembelow{O}{\fplus})-C(-[2]CH_3)(-[6]OH)-CH_3}\elmove{e1}{10:4mm}{e2}{-10:4mm} }
+ \arrow[,,1.42]{$-\ch{H2O}$}{}
+ \reactant{ \chemfig{\chembelow{C}{\fplus}(-[4]*6(=-=-=-))(-[2]*6(=-=-=-))-C(-[2]CH_3)(-[6]OH)-CH_3} }{}
+ % going down:
+ \arrow[a.-45,-|>]{}{}
+ \reactant[-45]{ \chemfig{C(-[4]*6(=-=-=-))(-[2]*6(=-=-=-))(-[6,,,2]HO)-C(-[2]CH_3)(-[@{e3}6]@{e4}\chembelow{O}{\fplus}H_2)-CH_3}\elmove{e3}{170:4mm}{e4}{-170:4mm} }
+ \arrow[,,1.42]{$-\ch{H2O}$}{}
+ \reactant{ \chemfig{C(-[4]*6(=-=-=-))(-[2]*6(=-=-=-))(-[6,,,2]HO)-\chembelow{C}{\fplus}(-[2]CH_3)-CH_3} }
+ \end{rxn}
+\end{beispiel}
+
+\section{Condensation Reaction}
+\begin{rxnscheme}{Condensation Reaction}
+ \reactant{\chemfig{**6(---(-CH_2OH)-(-OH)--)}}
+ \chemand
+ \reactant{\chemfig{**6(----(-OH)-(-HOCH_2)-)}}
+ \arrow[,-+>]{}{\ch{H2O}}
+ \reactant{\chemfig{**6(---(-CH_2-[:-30]O-[:30]CH_2-[:-30]**6(-----(-OH)-))-(-OH)--)}}
+ \arrow[-90,-+>,,dec]{}{\ch{CH2O}}
+ \anywhere{dec.180,,xshift=-.2em}{\SI{200}{\celsius}}
+ \reactant[-90,target]{\chemfig{**6(---(-CH_2-[:-30]**6(-----(-OH)-))-(-OH)--)}}
+ \branch[left=of target]{
+ \reactant{\chemfig{**6(---(-CH_2OH)-(-OH)--)}}
+ \chemand
+ \reactant{\chemfig{**6(----(-OH)-(-H)-)}}
+ \arrow[,-+>]{}{\ch{H2O}}
+ }
+\end{rxnscheme}
+
+\begin{beispiel}[code only]
+ \begin{rxnscheme}{Condensation Reaction}
+ \reactant{\chemfig{**6(---(-CH_2OH)-(-OH)--)}}
+ \chemand
+ \reactant{\chemfig{**6(----(-OH)-(-HOCH_2)-)}}
+ \arrow[,-+>]{}{\ch{H2O}}
+ \reactant{\chemfig{**6(---(-CH_2-[:-30]O-[:30]CH_2-[:-30]**6(-----(-OH)-))-(-OH)--)}}
+ \arrow[-90,-+>,,dec]{}{\ch{CH2O}}
+ \anywhere{dec.180,,xshift=-.2em}{\SI{200}{\celsius}}
+ \reactant[-90,target]{\chemfig{**6(---(-CH_2-[:-30]**6(-----(-OH)-))-(-OH)--)}}
+ \branch[left=of target]{
+ \reactant{\chemfig{**6(---(-CH_2OH)-(-OH)--)}}
+ \chemand
+ \reactant{\chemfig{**6(----(-OH)-(-H)-)}}
+ \arrow[,-+>]{}{\ch{H2O}}
+ }
+ \end{rxnscheme}
+\end{beispiel}
+
+\section{Substitution vs. Elimination}
+\begin{rxnscheme}{Substitution vs. Elimination}
+ % first reaction:
+ \reactant[,start_a]{\chemfig{@{H}H-[@{b1}:-60]\chemabove{C}{\scriptstyle\beta}(<[:-100]H)(<:[:-150]H)-[@{b2}]\chemabove{C}{\scriptstyle\alpha}(<[:20]H)(<:[:60]H)-[@{b3}:-60]@{X1}X}}
+ \arrow{E2}{}
+ \reactant{\chemfig{H-[:60]C(-[:120]H)=C(-[:60]H)-[:-60]H}}
+ \chemand
+ \reactant{\ch{X-}}
+ \chemand
+ \reactant{\chemfig{O(-[:60]H)-[:-60]H}}
+ % second reaction:
+ \reactant[start_a.-90,start_b,yshift=-4em]{\chemfig{H-[:-60]C(<[:-100]H)(<:[:-150]H)-@{C}C(<[:20]H)(<:[:60]H)-[@{b4}:-60]@{X2}X}}
+ \arrow{S$_\text{N}$2}{}
+ \reactant{\chemfig{H-[:-60]C(<[:-100]H)(<:[:-150]H)-C(<[:-80]H)(<:[:-30]H)-[:60]OH}}
+ \chemand
+ \reactant{\ch{X-}}
+ % nucleophile/base:
+ \anywhere{start_b.135,nuc,xshift=-3em,yshift=2em}{\chemfig{H-@{O}\chemabove{\lewis{026,O}}{\hspace{5mm}\fscrm}}}
+ % electron movements:
+ \anywhere{nuc.0}{
+ \elmove{O}{90:1.5cm}{H}{180:1cm}
+ \elmove{b1}{60:1cm}{b2}{90:5mm}
+ \elmove{b3}{-170:5mm}{X1}{180:5mm}
+ \elmove{O}{-90:1cm}{C}{100:1.5cm}
+ \elmove{b4}{-170:5mm}{X2}{180:5mm}
+ }
+\end{rxnscheme}
+
+You may see in line 20 that the \cmd{elmove} commands are put inside of
+\cmd{anywhere}. This is necessary in order to produce the right scheme. But this
+time you can position \cmd{anywhere} literally anywhere.
+\begin{beispiel}[code only]
+ \begin{rxnscheme}{Substitution vs. Elimination}
+ % first reaction:
+ \reactant[,start_a]{\chemfig{@{H}H-[@{b1}:-60]\chemabove{C}{\scriptstyle\beta}(<[:-100]H)(<:[:-150]H)-[@{b2}]\chemabove{C}{\scriptstyle\alpha}(<[:20]H)(<:[:60]H)-[@{b3}:-60]@{X1}X}}
+ \arrow{\mech[e2}{}
+ \reactant{\chemfig{H-[:60]C(-[:120]H)=C(-[:60]H)-[:-60]H}}
+ \chemand
+ \reactant{\ch{X-}}
+ \chemand
+ \reactant{\chemfig{O(-[:60]H)-[:-60]H}}
+ % second reaction:
+ \reactant[start_a.-90,start_b,yshift=-4em]{\chemfig{H-[:-60]C(<[:-100]H)(<:[:-150]H)-@{C}C(<[:20]H)(<:[:60]H)-[@{b4}:-60]@{X2}X}}
+ \arrow{\mech[2]}{}
+ \reactant{\chemfig{H-[:-60]C(<[:-100]H)(<:[:-150]H)-C(<[:-80]H)(<:[:-30]H)-[:60]OH}}
+ \chemand
+ \reactant{\ch{X-}}
+ % nucleophile/base:
+ \anywhere{start_b.135,nuc,xshift=-3em,yshift=2em}{\chemfig{H-@{O}\chemabove{\lewis{026,O}}{\hspace{5mm}\fscrm}}}
+ % electron movements:
+ \anywhere{nuc.0}{
+ \elmove{O}{90:1.5cm}{H}{180:1cm}
+ \elmove{b1}{60:1cm}{b2}{90:5mm}
+ \elmove{b3}{-170:5mm}{X1}{180:5mm}
+ \elmove{O}{-90:1cm}{C}{100:1.5cm}
+ \elmove{b4}{-170:5mm}{X2}{180:5mm}
+ }
+ \end{rxnscheme}
+\end{beispiel}
+
+\section{Scheme with three Lines}\label{sec:three_lines}
+\begin{rxnscheme}{Scheme with three Lines}
+ \setatomsep{1.5em}
+ \footnotesize
+ \reactant[,start]{\chemfig{EtO-(=[2]O)-[:-60](-Br)-[:-120](=[6]O)-[4]EtO}}
+ \chemand
+ \reactant{\chemfig{*6(-=-=-*5(-(=O)-\chemabove{\lewis{4:,N}}{\fscrm}(-[4,.7,,,draw=none]\chemabove{K}{\fscrp})-(=O)--)=)}}
+ \arrow{}{}
+ \reactant{\chemfig{*6(-=-=-*5(-(=O)-N(-(-[::-60](=[::-60]O)-[::60]EtO)-[::60](=[::60]O)-[::-60]EtO)-(=O)--)=)}}
+ % newline, started with \anywhere:
+ \anywhere{start.-90,a,xshift=-4em,yshift=-5em}{}
+ \arrow[a.0,,.6]{\chemabove{\lewis{0:,B}}{\fscrm}}{}
+ \arrow{\ch{R-X}}{}
+ \reactant{\chemfig{*6(-=-=-*5(-(=O)-N(-(-[4]R)(-[::-60](=[::-60]O)-[::60]EtO)-[::60](=[::60]O)-[::-60]EtO)-(=O)--)=)}}
+ \arrow[,,1.25]{\Hpl/\ch{H2O}}{}
+ \reactant{\chemfig{*6(-=-=-*5(-(=O)-N(-(-[4]R)(-[::-60](=[::-60]O)-[::60]HO_2C)-[::60](=[::60]O)-[::-60]HO_2C)-(=O)--)=)}}
+ % newline, started with \anywhere:
+ \anywhere{a.-90,b,yshift=-7em}{}
+ \arrow[b.0]{$- {\ch{CO2}}$}{}
+ \arrow{\Hpl}{\ch{H2O}}
+ \reactant{\chemfig{R-(-[6]H)(-[2]C|O_2\mch)-NH_3\pch}}
+\end{rxnscheme}
+\begin{beispiel}[code only]
+ \begin{rxnscheme}{Scheme with three Lines}
+ \setatomsep{1.5em}
+ \footnotesize
+ \reactant[,start]{\chemfig{EtO-(=[2]O)-[:-60](-Br)-[:-120](=[6]O)-[4]EtO}}
+ \chemand
+ \reactant{\chemfig{*6(-=-=-*5(-(=O)-\chemabove{\lewis{4:,N}}{\fscrm}(-[4,.7,,,draw=none]\chemabove{K}{\fscrp})-(=O)--)=)}}
+ \arrow{}{}
+ \reactant{\chemfig{*6(-=-=-*5(-(=O)-N(-(-[::-60](=[::-60]O)-[::60]EtO)-[::60](=[::60]O)-[::-60]EtO)-(=O)--)=)}}
+ % newline, started with \anywhere:
+ \anywhere{start.-90,a,xshift=-4em,yshift=-5em}{}
+ \arrow[a.0,,.6]{\chemabove{\lewis{0:,B}}{\fscrm}}{}
+ \arrow{\ch{R-X}}{}
+ \reactant{\chemfig{*6(-=-=-*5(-(=O)-N(-(-[4]R)(-[::-60](=[::-60]O)-[::60]EtO)-[::60](=[::60]O)-[::-60]EtO)-(=O)--)=)}}
+ \arrow[,,1.25]{\Hpl/\ch{H2O}}{}
+ \reactant{\chemfig{*6(-=-=-*5(-(=O)-N(-(-[4]R)(-[::-60](=[::-60]O)-[::60]HO_2C)-[::60](=[::60]O)-[::-60]HO_2C)-(=O)--)=)}}
+ % newline, started with \anywhere:
+ \anywhere{a.-90,b,yshift=-7em}{}
+ \arrow[b.0]{$- {\ch{CO2}}$}{}
+ \arrow{\Hpl}{\ch{H2O}}
+ \reactant{\chemfig{R-(-[6]H)(-[2]C|O_2\mch)-NH_3\pch}}
+ \end{rxnscheme}
+\end{beispiel}
+
+
+\section{Hydratisation}\label{sec:hydratisation}
+\pgfdeclaredecoration{ddbond}{initial}{%
+ \state{initial}[width=2pt]{%
+ \pgfpathlineto{\pgfpoint{2pt}{0pt}}%
+ \pgfpathmoveto{\pgfpoint{1.5pt}{2pt}}%
+ \pgfpathlineto{\pgfpoint{2pt}{2pt}}%
+ \pgfpathmoveto{\pgfpoint{2pt}{0pt}}%
+ }%
+ \state{final}{%
+ \pgfpathlineto{\pgfpointdecoratedpathlast}%
+ }%
+}%
+\tikzset{lddbond/.style={decorate,decoration=ddbond}}%
+\tikzset{rddbond/.style={decorate,decoration={ddbond,mirror}}}%
+A scheme with transition states.
+
+\begin{rxnscheme}{Hydratisation}
+ \reactant[,carbonyl_A]{\chemfig{R_2C=O}}
+ \anywhere{above=of carbonyl_A}{\chemfig{H-[:-30]O-[:30]H}}
+ \arrow[,<=>]{\tiny slow}{}
+ \transition[,transition_A]{\chemfig{R_2C(-[2,,2,,densely dotted]\chemabove{O}{\delp}(-[:150]H)-[:30]H)-[:-30,1.15,,,lddbond]O-[6,,,,densely dotted]H-[,,,,densely dotted]\chemabove{A}{\delm}}}
+ \anywhere{below=of transition_A,,text width=3cm}{(general transition state, acid cat.)}
+ \arrow[,<=>,.7]{}{}
+ \reactant{\chemfig{R_2C(-[:60]\chemabove{O}{\fscrp}H_2)-[:-60]OH}}
+ \arrow[below right,<=>,.7]{$-\Hpl$}{}
+ \reactant[below right]{\chemfig{R_2C(-[:60]OH)-[:-60]OH}}
+ \arrow[below left,<=>,.7]{}{\ch{H2O}}
+ \reactant[below left,zw]{\chemfig{R_2C(-[:60]OH)-[:-60]O|\mch}}
+ \arrow[left,<=>,.7]{}{}
+ \transition[left,transition_B]{\chemfig{R_2C(-[2,,2,,densely dotted]O(-[:150]H-[4,,,,densely dotted]\chemabove{B}{\delp})-[:30]H)-[:-30,1.15,,,lddbond]\chemabove{O}{\delm}-[6,,,,draw=none]\phantom{H}}}
+ \anywhere{below=of transition_B,,text width=3cm}{(general transition state, base cat.)}
+ \arrow[left,<=>]{}{\tiny slow}
+ \reactant[left,carbonyl_B]{\chemfig{R_2C=O}}
+ \anywhere{above=of carbonyl_B}{\chemfig{H-[:-30]O-[:30]H}}
+\end{rxnscheme}
+
+For this example we first declare a style for the delocalized double bonds:
+\begin{beispiel}[code only]
+ \pgfdeclaredecoration{ddbond}{initial}{%
+ \state{initial}[width=2pt]{%
+ \pgfpathlineto{\pgfpoint{2pt}{0pt}}%
+ \pgfpathmoveto{\pgfpoint{1.5pt}{2pt}}%
+ \pgfpathlineto{\pgfpoint{2pt}{2pt}}%
+ \pgfpathmoveto{\pgfpoint{2pt}{0pt}}%
+ }%
+ \state{final}{%
+ \pgfpathlineto{\pgfpointdecoratedpathlast}%
+ }%
+ }%
+ \tikzset{lddbond/.style={decorate,decoration=ddbond}}%
+ \tikzset{rddbond/.style={decorate,decoration={ddbond,mirror}}}%
+\end{beispiel}
+Now the delocalized double bond can be used via \paket*{chemfig}'s fifth option
+(see the \paket{chemfig} manual):
+\begin{beispiel}[code only]
+ \chemfig{-[,,,,lddbond]-[,,,,rddbond]}
+\end{beispiel}
+\chemfig{-[,,,,lddbond]-[,,,,rddbond]}\par\medskip
+
+Then the whole code looks like follows:
+\begin{beispiel}[code only]
+ \begin{rxnscheme}{Hydratisation}
+ \reactant[,carbonyl_A]{\chemfig{R_2C=O}}
+ \anywhere{above=of carbonyl_A}{\chemfig{H-[:-30]O-[:30]H}}
+ \arrow[,<=>]{\tiny slow}{}
+ \transition[,transition_A]{\chemfig{R_2C(-[2,,2,,densely dotted]\chemabove{O}{\delp}(-[:150]H)-[:30]H)-[:-30,1.15,,,lddbond]O-[6,,,,densely dotted]H-[,,,,densely dotted]\chemabove{A}{\delm}}}
+ \anywhere{below=of transition_A,,text width=3cm}{(general transition state, acid cat.)}
+ \arrow[,<=>,.7]{}{}
+ \reactant{\chemfig{R_2C(-[:60]\chemabove{O}{\fscrp}H_2)-[:-60]OH}}
+ \arrow[below right,<=>,.7]{$-\Hpl$}{}
+ \reactant[below right]{\chemfig{R_2C(-[:60]OH)-[:-60]OH}}
+ \arrow[below left,<=>,.7]{}{\ch{H2O}}
+ \reactant[below left,zw]{\chemfig{R_2C(-[:60]OH)-[:-60]O|\mch}}
+ \arrow[left,<=>,.7]{}{}
+ \transition[left,transition_B]{\chemfig{R_2C(-[2,,2,,densely dotted]O(-[:150]H-[4,,,,densely dotted]\chemabove{B}{\delp})-[:30]H)-[:-30,1.15,,,lddbond]\chemabove{O}{\delm}-[6,,,,draw=none]\phantom{H}}}
+ \anywhere{below=of transition_B,,text width=3cm}{(general transition state, base cat.)}
+ \arrow[left,<=>]{\tiny langsam}{}
+ \reactant[left,carbonyl_B]{\chemfig{R_2C=O}}
+ \anywhere{above=of carbonyl_B}{\chemfig{H-[:-30]O-[:30]H}}
+ \end{rxnscheme}
+\end{beispiel}
+You can see that \cmd{anywhere} was used several times, either to place molecules
+or to label molecules.
+
+\section{Esterification}\label{sec:veresterung}
+\begin{rxnscheme}{Esterification}
+ \reactant{\chemfig{H-C(=[:60]O)-[:-60]O-H}}
+ \arrow[,-+>,1.5,protolysis]{\ch{H2SO4}}{\ch{HSO4-}}
+ \anywhere{below=of protolysis,,yshift=1em}{\tiny protolysis}
+ \mesomeric{
+ \reactant{\chemfig{H-@{a2}C(-[:60]O-H)(-[:30,.5,,,draw=none]{\fscrp})-[:-60]O-H}}
+ \marrow
+ \reactant{\chemfig{H-C(=[:60]\chemabove{O}{\fscrp}-H)-[:-60]O-H}}
+ }
+ \branch[below,,xshift=-5em]{
+ \arrow[below,<=>]{\chemfig{H-[:120]@{a1}O-[:60]CH_3}}{\tiny addition}
+ \reactant[below]{\chemfig{H-C(-[2]O-[:30]H)(-\chemabove{O}{\fscrp}(-[:60]CH_3)-[:-60]H)-[6]O-[:-30]H}\elmove{a1}{90:1.5cm}{a2}{0:3cm}}
+ }
+ \branch[left,,yshift=-3.5em]{
+ \arrow[left,<=>]{}{\tiny protolysis}
+ }
+ \reactant[left]{\chemfig{H-C(-[2]O-[:30]H)(-O-CH_3)-[@{b1}6]@{a3}\chemabove{O}{\hspace*{-4mm}\fscrp}(-[:-150]H)-[:-30]H}\elmove{b1}{0:5mm}{a3}{20:5mm}}
+ \arrow[below,<=>]{$- {\ch{H2O}}$}{\tiny elimination}
+ \mesomeric[below,,xshift=6em]{
+ \reactant{\chemfig{H-C(-[:60]O-H)(-[,.5,,,draw=none]{\fscrp})-[:-60]O-CH_3}}
+ \marrow
+ \reactant{\chemfig{H-C(=[:60]\chemabove{O}{\fscrp}-H)-[:-60]O-CH_3}}
+ }
+ \arrow[,-+>,1.5]{\ch{HSO4-}}{\ch{H2SO4}}
+ \reactant{\chemfig{H-C(=[:60]O)-[:-60]O-CH_3}}
+\end{rxnscheme}
+
+\begin{beispiel}[code only]
+ \begin{rxn}{Esterification}
+ \reactant{\chemfig{H-C(=[:60]O)-[:-60]O-H}}
+ \arrow[,-+>,1.2,protolysis]{\ch{H2SO4}}{\ch{HSO4-}}
+ \anywhere{below=of protolysis,,yshift=1em}{\tiny protolysis}
+ \mesomeric{
+ \reactant{\chemfig{H-@{a2}C(-[:60]O-H)(-[:30,.5,,,draw=none]{\fscrp})-[:-60]O-H}}
+ \marrow
+ \reactant{\chemfig{H-C(=[:60]\chemabove{O}{\fscrp}-H)-[:-60]O-H}}
+ }
+ \branch[below,,xshift=-5em]{
+ \arrow[below,<=>]{\tiny addition}{\chemfig{H-[:120]@{a1}O-[:60]CH_3}}
+ \reactant[below]{
+ \chemfig{H-C(-[2]O-[:30]H)(-\chemabove{O}{\fscrp}(-[:60]CH_3)-[:-60]H)-[6]O-[:-30]H}
+ \elmove{a1}{90:1.5cm}{a2}{0:3cm}
+ }
+ }
+ \branch[left,,yshift=-3.5em]{
+ \arrow[left,<=>]{}{\tiny protolysis}
+ }
+ \reactant[left]{
+ \chemfig{H-C(-[2]O-[:30]H)(-O-CH_3)-[@{b1}6]@{a3}\chemabove{O}{\hspace*{-4mm}\fscrp}(-[:-150]H)-[:-30]H}
+ \elmove{b1}{0:5mm}{a3}{20:5mm}
+ }
+ \arrow[below,<=>]{$- {\ch{H2O}}$}{\tiny elimination}
+ \mesomeric[below,,xshift=6em]{
+ \reactant{\chemfig{H-C(-[:60]O-H)(-[,.5,,,draw=none]{\fscrp})-[:-60]O-CH_3}}
+ \marrow
+ \reactant{\chemfig{H-C(=[:60]\chemabove{O}{\fscrp}-H)-[:-60]O-CH_3}}
+ }
+ \arrow[,-+>,1.2]{\ch{HSO4-}}{\ch{H2SO4}}
+ \reactant{\chemfig{H-C(=[:60]O)-[:-60]O-CH_3}}
+ \end{rxnscheme}
+\end{beispiel}
+
+\section{Electrophilic Addition}\label{sec:elektrophile_addition}
+This scheme forms a circle.
+\begin{rxnscheme}{Electrophilic Addition}
+ \setarrowlength{3em}
+ \reactant{\chemfig{>[:-20]C(<[:40])=[6]C(<[:-130])<[:-20]}}
+ \chemand[,plus]
+ \reactant{\chemfig{\lewis{246,Br}-\lewis{026,Br}}}
+ \arrow[plus.-90,<=>]{\footnotesize fast}{}
+ \reactant[-90,attack]{\chemfig{>[:-20]C(<[:40])=[@{db}6]C(<[:-130])<[:-20]}}
+ \anywhere{right=of attack}{
+ \chemfig{@{Br1}\lewis{246,Br}-[@{b2}]@{Br2}\lewis{026,Br}}
+ \elmove{db}{20:5mm}{Br1}{135:5mm}
+ \elmove{b2}{-120:5mm}{Br2}{-120:5mm}
+ }
+ % to the left:
+ \arrow[attack.-135,<=>,2]{$- {\ch{Br-}}$}{\footnotesize slow}
+ \reactant[-135,carbenium_a]{\vflipnext\chemfig{-[:-30]\chembelow{C}{\fscrp}(-[:30])-[6]C(<[:-150])(<:[:-100])-[:-30]\lewis{137,Br}}}
+ \anywhere{below=of carbenium_a}{\footnotesize carbenium ion}
+ \arrow[,<<=>]{}{}
+ \reactant[,bromonium]{\chemfig{>:[:-60]C?(<[:160])-[6]C(<[:-110])(<:[:-150])-[:30]\lewis{17,Br}?-[4,.5,,,draw=none]{\fscrp}}}
+ \anywhere{below=of bromonium,,yshift=.35em}{\footnotesize bromonium ion}
+ % to the right:
+ \arrow[attack.-45,<=>,2]{\footnotesize slow}{$- {\ch{Br-}}$}
+ \reactant[-45,carbenium_b]{\chemfig{-[:-30]\chemabove{C}{\fscrp}(-[:30])-[6]C(<:[:-150])(<[:-100])-[:-30]\lewis{157,Br}}}
+ \anywhere{below=of carbenium_b}{\footnotesize carbenium ion}
+ \arrow[left,<<=>]{}{}
+ \mCsetup{reset}
+\end{rxnscheme}
+
+\begin{beispiel}[code only]
+ \begin{rxnscheme}{Electrophilic Addition}
+ \setarrowlength{3em}
+ \reactant{\chemfig{>[:-20]C(<[:40])=[6]C(<[:-130])<[:-20]}}
+ \chemand[,plus]
+ \reactant{\chemfig{\lewis{246,Br}-\lewis{026,Br}}}
+ \arrow[plus.-90,<=>]{\footnotesize fast}{}
+ \reactant[-90,attack]{\chemfig{>[:-20]C(<[:40])=[@{db}6]C(<[:-130])<[:-20]}}
+ \anywhere{right=of attack}{
+ \chemfig{@{Br1}\lewis{246,Br}-[@{b2}]@{Br2}\lewis{026,Br}}
+ \elmove{db}{20:5mm}{Br1}{135:5mm}
+ \elmove{b2}{-120:5mm}{Br2}{-120:5mm}
+ }
+ % to the left:
+ \arrow[attack.-135,<=>,2]{$- {\ch{Br-}}$}{\footnotesize slow}
+ \reactant[-135,carbenium_a]{\vflipnext\chemfig{-[:-30]\chembelow{C}{\fscrp}(-[:30])-[6]C(<[:-150])(<:[:-100])-[:-30]\lewis{137,Br}}}
+ \anywhere{below=of carbenium_a}{\footnotesize carbenium ion}
+ \arrow[,<<=>]{}{}
+ \reactant[,bromonium]{\chemfig{>:[:-60]C?(<[:160])-[6]C(<[:-110])(<:[:-150])-[:30]\lewis{17,Br}?-[4,.5,,,draw=none]{\fscrp}}}
+ \anywhere{below=of bromonium,,yshift=.35em}{\footnotesize bromonium ion}
+ % to the right:
+ \arrow[attack.-45,<=>,2]{\footnotesize slow}{$- {\ch{Br-}}$}
+ \reactant[-45,carbenium_b]{\chemfig{-[:-30]\chemabove{C}{\fscrp}(-[:30])-[6]C(<:[:-150])(<[:-100])-[:-30]\lewis{157,Br}}}
+ \anywhere{below=of carbenium_b}{\footnotesize carbenium ion}
+ \arrow[left,<<=>]{}{}
+ \mCsetup{reset}
+ \end{rxnscheme}
+\end{beispiel}
+
+\section{Activation of Fatty Acids}\label{sec:activation_fatty_acid}
+\begin{rxnscheme}{Activation of Fatty Acids}
+ \reactant[,ATP]{\chemfig{\chemabove{O}{\hspace*{-5mm}\fscrm}-P(=[2]O)(-[6]\chembelow{O}{\fscrm})-O-P(=[2]O)(-[6]\chembelow{O}{\fscrm})-@{O1}O-[@{b1}]@{P}P(=[2]O)(-[6]\chembelow{O}{\fscrm})-O-CH_2-[6,1.5,1](-[6,.5])(-[:20,1.3]O?[a])<[7](-[2,.5])(-[6]OH)-[,,,,line width=3pt](-[2,.5])(-[6]OH)>[1]?[a](-[6,.5])-[2,1.5]N?[b]-[:18]([:30]*6(-N=-N=(-NH_2)-=))-[:90]-[:162]N=^[:-126]?[b]}}
+ \anywhere{below right=of ATP,,xshift=-4em,yshift=3em}{\bfseries ATP}
+ \arrow[below,,1.5]{}{\chemname{\chemfig{R-C(=[:-60]O)-[:60]@{O2}O-[@{b2}]H}}{fatty acid}}
+ \branch[on chain=going below]{
+ \reactant[,pyrophosphat]{
+ \chemfig{\chemabove{O}{\hspace*{-5mm}\fscrm}-P(=[2]O)(-[6]\chembelow{O}{\fscrm})-O-P(=[2]O)(-[6]\chembelow{O}{\fscrm})-\chemabove{O}{\hspace*{5mm}\fscrm}}
+ \elmove{b1}{100:1cm}{O1}{90:5mm}
+ \elmove{O2}{135:1cm}{P}{-135:1cm}
+ \elmove{b2}{-90:5mm}{O2}{-60:5mm}
+ }
+ \anywhere{below=of pyrophosphat}{pyrophosphate PP$_\text{i}$}
+ \chemand
+ \reactant[,acyl-amp]{\chemfig{R-@{C}C(=[:-60]O)-[@{b3}:60]@{O3}O-P(-[6]\chembelow{O}{\fscrm})(=[2]O)-O-CH_2-[6,,1,1]r|ibos|e-[2,1.05,3,1]a|denine}}
+ \anywhere{below=of acyl-amp}{\bfseries acyl-AMP}
+ }
+ \branch[on chain=going below,,xshift=-8em]{
+ \arrow[below]{\ch{H2O}}{}
+ \reactant[below,Pi]{2~\chemfig{HO-P(=[2]O)(-[6]\chembelow{O}{\fscrm})-O}}
+ \anywhere{below right=of Pi}{P$_\text{i}$}
+ }
+ \branch[,,xshift=4em]{
+ \arrow[below,-+>]{\chemfig{CoA-@{S}S-[@{b4}:-60]H}}{AMP}
+ \reactant[below,acyl-SCoA]{
+ \chemfig{R-C(=[:-60]O)-[:60]S-CoA}
+ \elmove{S}{45:3cm}{C}{-120:2cm}
+ \elmove{b3}{135:5mm}{O3}{110:7mm}
+ \elmove{b4}{-120:7mm}{S}{-100:5mm}
+ }
+ \anywhere{below=of acyl-SCoA}{acyl-SCoA}
+ }
+\end{rxnscheme}
+
+\begin{beispiel}[code only]
+ \begin{rxnscheme}{Activation of Fatty Acids}
+ \reactant[,ATP]{\chemfig{\chemabove{O}{\hspace*{-5mm}\fscrm}-P(=[2]O)(-[6]\chembelow{O}{\fscrm})-O-P(=[2]O)(-[6]\chembelow{O}{\fscrm})-@{O1}O-[@{b1}]@{P}P(=[2]O)(-[6]\chembelow{O}{\fscrm})-O-CH_2-[6,1.5,1](-[6,.5])(-[:20,1.3]O?[a])<[7](-[2,.5])(-[6]OH)-[,,,,line width=3pt](-[2,.5])(-[6]OH)>[1]?[a](-[6,.5])-[2,1.5]N?[b]-[:18]([:30]*6(-N=-N=(-NH_2)-=))-[:90]-[:162]N=^[:-126]?[b]}}
+ \anywhere{below right=of ATP,,xshift=-4em,yshift=3em}{\bfseries ATP}
+ \arrow[below,,1.5]{\chemname{\chemfig{R-C(=[:-60]O)-[:60]@{O2}O-[@{b2}]H}}{fatty acid}}{}
+ \branch[on chain=going below]{
+ \reactant[,pyrophosphat]{
+ \chemfig{\chemabove{O}{\hspace*{-5mm}\fscrm}-P(=[2]O)(-[6]\chembelow{O}{\fscrm})-O-P(=[2]O)(-[6]\chembelow{O}{\fscrm})-\chemabove{O}{\hspace*{5mm}\fscrm}}
+ \elmove{b1}{100:1cm}{O1}{90:5mm}
+ \elmove{O2}{135:1cm}{P}{-135:1cm}
+ \elmove{b2}{-90:5mm}{O2}{-60:5mm}
+ }
+ \anywhere{below=of pyrophosphat}{pyrophosphate PP$_\text{i}$}
+ \chemand
+ \reactant[,acyl-amp]{\chemfig{R-@{C}C(=[:-60]O)-[@{b3}:60]@{O3}O-P(-[6]\chembelow{O}{\fscrm})(=[2]O)-O-CH_2-[6,,1,1]r|ibos|e-[2,1.05,3,1]A|denine}}
+ \anywhere{below=of acyl-amp}{\bfseries acyl-AMP}
+ }
+ \branch[on chain=going below,,xshift=-8em]{
+ \arrow[below]{\ch{H2O}}{}
+ \reactant[below,Pi]{2~\chemfig{HO-P(=[2]O)(-[6]\chembelow{O}{\fscrm})-O}}
+ \anywhere{below right=of Pi}{P$_\text{i}$}
+ }
+ \branch[,,xshift=4em]{
+ \arrow[below,-+>]{\chemfig{CoA-@{S}S-[@{b4}:-60]H}}{AMP}
+ \reactant[below,acyl-SCoA]{
+ \chemfig{R-C(=[:-60]O)-[:60]S-CoA}
+ \elmove{S}{135:2cm}{C}{-135:1cm}
+ \elmove{b3}{-45:5mm}{O3}{-70:7mm}
+ \elmove{b4}{-120:7mm}{S}{-100:5mm}
+ }
+ \anywhere{below=of acyl-SCoA}{acyl-SCoA}
+ }
+ \end{rxnscheme}
+\end{beispiel}
+
+\section{Change the layout with \TikZ}\label{sec:tikz_layout}
+\begin{rxnscheme}{Change the layout with \TikZ}
+ \colorlet{mCgreen}{green!50!gray}
+ \colorlet{mCblue}{cyan!50!gray}
+ \colorlet{mCred}{magenta!50!gray}
+ \tikzset{reactant/.style={draw=#1,fill=#1!10,minimum width=.8\textwidth,inner sep=1em,rounded corners}}
+ \mCsetup{arrowlength=3em,arrowline=very thick}
+ \reactant[,,reactant=mCgreen]{
+ \chemname{\chemfig{Alky|l--[6](-[4,,,2]Acy|l)-[6]-O-P(=[2]O)(-[6]O|\mch)-O-[:-30]-[:30]-[:-30]NH_2}}{\bfseries Phosphatidylethanolamine}
+ }
+ \arrow[below]{\iupac{\N\-acyl\|transferase}}{}
+ \reactant[below,,reactant=mCblue]{
+ \chemname{\chemfig{Alky|l--[6](-[4,,,2]Acy|l)-[6]-O-P(=[2]O)(-[6]O|\mch)-O-[:-30]-[:30]-[:-30]\chembelow{N}{H}-[:30](=[2]O)-[:-30]-[:30]-[:-30]-[:30]=_-[:-30]-[:30]=_-[:-60]-[::-60]=_[:180]-[::-30]-[::60]=_[:180]-[::-30]-[::60]-[::-60]-[::60]-[6]}}{\bfseries\iupac{\N\-arachidonoyl\-PE}}
+ }
+ \arrow[below]{Phospholipase D}{}
+ \reactant[below,,reactant=mCred]{
+ \chemname{\chemfig{HO-[:-30]-[:30]-[:-30]\chembelow{N}{H}-[:30](=[2]O)-[:-30]-[:30]-[:-30]-[:30]=_-[:-30]-[:30]=_-[:-60]-[::-60]=_[:180]-[::-30]-[::60]=_[:180]-[::-30]-[::60]-[::-60]-[::60]-[6]}}{\bfseries Anandamide}
+ }
+ \mCsetup{reset}
+\end{rxnscheme}
+
+This is an example for the usage of the \code{<tikz>} option. Please take a closer
+look at lines \numlist{5;7;11;15}.
+\begin{beispiel}[code only]
+ \begin{rxnscheme}{Change the layout with \TikZ}
+ \colorlet{mCgreen}{green!50!gray}
+ \colorlet{mCblue}{cyan!50!gray}
+ \colorlet{mCred}{magenta!50!gray}
+ !!\tikzset{reactant/.style={draw=#1,fill=#1!10,minimum width=.8\textwidth,inner sep=1em,rounded corners}}!!
+ \mCsetup{arrowlength=3em,arrowline=very thick}
+ \reactant[,,!!reactant=mCgreen!!]{
+ \chemname{\chemfig{Alky|l--[6](-[4,,,2]Acy|l)-[6]-O-P(=[2]O)(-[6]O|\mch)-O-[:-30]-[:30]-[:-30]NH_2}}{\bfseries Phosphatidylethanolamine}
+ }
+ \arrow[below]{}{\iupac{\N-acyl\|transferase}}
+ \reactant[below,,!!reactant=mCblue!!]{
+ \chemname{\chemfig{Alky|l--[6](-[4,,,2]Acy|l)-[6]-O-P(=[2]O)(-[6]O|\mch)-O-[:-30]-[:30]-[:-30]\chembelow{N}{H}-[:30](=[2]O)-[:-30]-[:30]-[:-30]-[:30]=_-[:-30]-[:30]=_-[:-60] -[::-60]=_[:180]-[::-30]-[::60]=_[:180]-[::-30]- [::60]-[::-60]-[::60]-[6]}}{\bfseries\iupac{\N\-arachidonoyl\-PE}}
+ }
+ \arrow[below]{}{Phospholipase D}
+ \reactant[below,,!!reactant=mCred!!]{
+ \chemname{\chemfig{HO-[:-30]-[:30]-[:-30]\chembelow{N}{H}-[:30](=[2]O)-[:-30]-[:30]-[:-30]-[:30]=_-[:-30]-[:30]=_-[:-60] -[::-60]=_[:180]-[::-30]-[::60]=_[:180]-[::-30]- [::60]-[::-60]-[::60]-[6]}}{\bfseries Anandamide}
+ }
+ \mCsetup{reset}
+ \end{rxnscheme}
+\end{beispiel}
+
+\section{Claisen-Kondensation}
+\begin{rxnscheme}{Claisen-Kondensation}
+ \colorlet{mCred}{red!50!gray}
+ \setatomsep{1.5em}
+ % Ergebnis:
+ \branch[,one,draw=mCred,fill=mCred!10,rounded corners,inner sep=.5em]{
+ \reactant{\chemfig{[:30]-(=[2]O)-[:-30]O--[:-30]}}
+ \chemand
+ \reactant{\chemfig{[:30]-(=[2]O)-[:-30]O--[:-30]}}
+ \arrow[,,2]{\ch{NaOEt}, \ch{EtOH}}{}
+ \reactant{\chemfig{[:30]-(=[2]O)-[:-30]-(=[2]O)-[:-30]O--[:-30]}}
+ }
+ % Mechanismus:
+ \branch[-90,,xshift=-13.5em]{
+ \arrow[-90,<<=>]{\ch{^-OEt}}{}
+ }
+ \mesomeric[-90,two,xshift=4.5em]{
+ \reactant{\chemfig{[:30](-[:150,.3,,,draw=none]@{C1}\fscrm)-(=[2]O)-[:-30]O--[:-30]}}
+ \marrow
+ \reactant{\chemfig{[:30]=(-[2]O|\mch)-[:-30]O--[:-30]}}
+ }
+ \chemand
+ \reactant{\ch{EtOH}}
+ \branch[two.-90,three,xshift=-5.5em]{
+ \arrow[-90,<=>,,,both]{\chemfig[][scale=.7]{[:30]-@{C2}(=[@{b1}2]O@{O1})-[:-30]O--[:-30]}}{}
+ }
+ \reactant[three.-90]{\chemfig{-(-[@{b2}2]@{O2}O|\mch)(-[6]-[:-30](=[6]O)-[:30]O-[:-30]-[:30])-[@{b3}]@{O3}O-[:30]-[:-30]}}
+ \arrow[,<=>]{}{}
+ \reactant[,four]{\chemfig{[:30]-(=[2]O)-[:-30]@{C3}(-[:-120]H)(-[@{b4}:-60]H@{H})-(=[2]O)-[:-30]O--[:-30]}}
+ \chemand
+ \reactant{\chemfig{\mch @{O4}OEt}}
+ \arrow[four.-90]{}{}
+ \mesomeric[-90]{
+ \reactant{\chemfig{[:30]-(=[2]O)-[:-30]=(-[2]O|\mch)-[:-30]O--[:-30]}}
+ \marrow
+ \reactant{\chemfig{[:30]-(=[2]O)-[:-30](-[6,.3,,,draw=none]\fscrm)-(=[2]O)-[:-30]O--[:-30]}}
+ \marrow
+ \reactant{\chemfig{[:30]-(-[2]O|\mch)=[:-30]-(=[2]O)-[:-30]O--[:-30]}}
+ }
+ \arrow[-90]{\Hpl, \ch{H2O}}{}
+ \reactant[-90]{\chemfig{[:30]-(=[2]O)-[:-30]-(=[2]O)-[:-30]O--[:-30]}}
+ \anywhere{one.0}{
+ \elmove{C1}{-100:2cm}{C2}{-90:2cm}
+ \elmove{b1}{10:5mm}{O1}{0:5mm}
+ \elmove{O2}{180:5mm}{b2}{180:5mm}
+ \elmove{b3}{80:5mm}{O3}{90:5mm}
+ \elmove{b4}{0:5mm}{C3}{0:7mm}
+ \elmove{O4}{-90:1cm}{H}{-45:1cm}
+ }
+\end{rxnscheme}
+
+\begin{beispiel}[code only]
+ \begin{rxnscheme}{Claisen-Kondensation}
+ \colorlet{mCred}{red!50!gray}
+ \setatomsep{1.5em}
+ % Ergebnis:
+ \branch[,one,draw=mCred,fill=mCred!10,rounded corners,inner sep=.5em]{
+ \reactant{\chemfig{[:30]-(=[2]O)-[:-30]O--[:-30]}}
+ \chemand
+ \reactant{\chemfig{[:30]-(=[2]O)-[:-30]O--[:-30]}}
+ \arrow[,,2]{\ch{NaOEt}, \ch{EtOH}}{}
+ \reactant{\chemfig{[:30]-(=[2]O)-[:-30]-(=[2]O)-[:-30]O--[:-30]}}
+ }
+ % Mechanismus:
+ \branch[-90,,xshift=-13.5em]{
+ \arrow[-90,<=>]{\ch{^-OEt}}{}
+ }
+ \mesomeric[-90,two,xshift=4.5em]{
+ \reactant{\chemfig{[:30](-[:150,.3,,,draw=none]@{C1}\fscrm)-(=[2]O)-[:-30]O--[:-30]}}
+ \marrow
+ \reactant{\chemfig{[:30]=(-[2]O|\mch)-[:-30]O--[:-30]}}
+ }
+ \chemand
+ \reactant{\ch{EtOH}}
+ \branch[two.-90,three,xshift=-5.5em]{
+ \arrow[-90,<=>,,,both]{\chemfig[][scale=.7]{[:30]-@{C2}(=[@{b1}2]O@{O1})-[:-30]O--[:-30]}}{}
+ }
+ \reactant[three.-90]{\chemfig{-(-[@{b2}2]@{O2}O|\mch)(-[6]-[:-30](=[6]O)-[:30]O-[:-30]-[:30])-[@{b3}]@{O3}O-[:30]-[:-30]}}
+ \arrow[,<=>]{}{}
+ \reactant[,four]{\chemfig{[:30]-(=[2]O)-[:-30]@{C3}(-[:-120]H)(-[@{b4}:-60]H@{H})-(=[2]O)-[:-30]O--[:-30]}}
+ \chemand
+ \reactant{\chemfig{\mch @{O4}OEt}}
+ \arrow[four.-90]{}{}
+ \mesomeric[-90]{
+ \reactant{\chemfig{[:30]-(=[2]O)-[:-30]=(-[2]O|\mch)-[:-30]O--[:-30]}}
+ \marrow
+ \reactant{\chemfig{[:30]-(=[2]O)-[:-30](-[6,.3,,,draw=none]\fscrm)-(=[2]O)-[:-30]O--[:-30]}}
+ \marrow
+ \reactant{\chemfig{[:30]-(-[2]O|\mch)=[:-30]-(=[2]O)-[:-30]O--[:-30]}}
+ }
+ \arrow[-90]{\Hpl, \ch{H2O}}{}
+ \reactant[-90]{\chemfig{[:30]-(=[2]O)-[:-30]-(=[2]O)-[:-30]O--[:-30]}}
+ \anywhere{one.0}{
+ \elmove{C1}{-100:2cm}{C2}{-90:2cm}
+ \elmove{b1}{10:5mm}{O1}{0:5mm}
+ \elmove{O2}{180:5mm}{b2}{180:5mm}
+ \elmove{b3}{80:5mm}{O3}{90:5mm}
+ \elmove{b4}{0:5mm}{C3}{0:7mm}
+ \elmove{O4}{-90:1cm}{H}{-45:1cm}
+ }
+ \end{rxnscheme}
+\end{beispiel}
+
+
+\section{Extensive Synthesis}\label{sec:tikzsynthese}
+As last example we can create extensive syntheses, using the \cmd{merge} command.
+\begin{rxnscheme}[,,,.8]{Extensive Synthesis}
+ \setatomsep{1.5em}
+ \branch[,start_left]{
+ \reactant{\chemfig{=_[::30]-[::-60]-[::60](-[::-60])(-[::120])-[::0]OH}}
+ \arrow[below]{\ch{HBr}}{}
+ \reactant[below]{\chemfig{Br-[::30]-[::-60]=_[::60](-[::-60])-[::60]}}
+ }
+ \branch[right=of start_left,start_center,yshift=1em]{
+ \reactant{\chemname{\chemfig[][scale=.8]{**6(--(-SO_2Cl)---(-)-)}}{tosyle chloride}}
+ \arrow[below]{\ch{NaOH}}{\ch{Zn}}
+ \reactant[below]{\chemfig[][scale=.8]{**6(--(-SO_2Na)---(-)-)}}
+ }
+ \branch[right=of start_center,start_right,xshift=3em,yshift=-10em]{
+ \reactant{\chemname{\chemfig{-[::30](-[::60])=_[::-60]-[::60]COOH}}{\iupac{3\-methyl\-2\-butenoic acid}}}
+ \arrow[below]{\ch{CH3OH}}{}
+ \reactant[below]{\chemfig{-[::30](-[::60])=_[::-60]-[::60]CO_2CH_3}}
+ }
+ \branch[below=of start_left,target_one,xshift=5em,yshift=-5em]{
+ \reactant{\chemfig[][scale=.8]{**6(--(-SO_2-[:30]-[::-60]=_[::60](-[::60])-[::-60])---(-)-)}}
+ }
+ \branch[below=of target_one,target_two,xshift=6em,yshift=-6em]{
+ \mesomeric{\chemfig[][scale=.8]{-[::30](-[::60])=^[::-60]-[::60](-[::60]S(=[::90]O)(=[::-90]O)-[::0]**6(---(-)---))-[::-60](-[::0])(-[::-120])-[::60](-[::60,.5,,,white]\fminus)-[::-60]CO_2CH_3}}
+ \arrow[below,,.5]{}{}
+ \arrow[below,,.5]{\ch{KOH}}{}
+ \reactant[below]{\chemname{\chemfig{-[::-30](-[::-60])=^[::60]>[::-60](-[::90,1.2])-[::30,1.2](-[::120,1.2](-[::-60])-[::0])<:[::-30]COOH}}{\iupac{\trans\-chrysanthemum acid}}}
+ }
+ \merge{target_one}{start_left}{start_center}
+ \merge[\ch{NaOCH3}]{target_two}{target_one}{start_right}
+\end{rxnscheme}
+\begin{beispiel}[code only]
+ \begin{rxnscheme}[,,,.8]{Extensive Synthesis}
+ \setatomsep{1.5em}
+ \branch[,start_left]{
+ \reactant{\chemfig{=_[::30]-[::-60]-[::60](-[::-60])(-[::120])-[::0]OH}}
+ \arrow[below]{\ch{HBr}}{}
+ \reactant[below]{\chemfig{Br-[::30]-[::-60]=_[::60](-[::-60])-[::60]}}
+ }
+ \branch[right=of start_left,start_center,yshift=1em]{
+ \reactant{\chemname{\chemfig[][scale=.8]{**6(--(-SO_2Cl)---(-)-)}}{tosyle chloride}}
+ \arrow[below]{\ch{NaOH}}{\ch{Zn}}
+ \reactant[below]{\chemfig[][scale=.8]{**6(--(-SO_2Na)---(-)-)}}
+ }
+ \branch[right=of start_center,start_right,xshift=3em,yshift=-10em]{
+ \reactant{\chemname{\chemfig{-[::30](-[::60])=_[::-60]-[::60]COOH}}{\iupac{3\-methyl\-2\-butenoic acid}}}
+ \arrow[below]{\ch{CH3OH}}{}
+ \reactant[below]{\chemfig{-[::30](-[::60])=_[::-60]-[::60]CO_2CH_3}}
+ }
+ \branch[below=of start_left,target_one,xshift=5em,yshift=-5em]{
+ \reactant{\chemfig[][scale=.8]{**6(--(-SO_2-[:30]-[::-60]=_[::60](-[::60])-[::-60])---(-)-)}}
+ }
+ \branch[below=of target_one,target_two,xshift=6em,yshift=-6em]{
+ \mesomeric{\chemfig[][scale=.8]{-[::30](-[::60])=^[::-60]-[::60](-[::60]S(=[::90]O)(=[::-90]O)-[::0]**6(---(-)---))-[::-60](-[::0])(-[::-120])-[::60](-[::60,.5,,,white]\fminus)-[::-60]CO_2CH_3}}
+ \arrow[below,,.5]{}{}
+ \arrow[below,,.5]{\ch{KOH}}{}
+ \reactant[below]{\chemname{\chemfig{-[::-30](-[::-60])=^[::60]>[::-60](-[::90,1.2])-[::30,1.2](-[::120,1.2](-[::-60])-[::0])<:[::-30]COOH}}{\iupac{\trans\-chrysanthemum acid}}
+ }
+ \merge{target_one}{start_left}{start_center}
+ \merge[\ch{NaOCH3}]{target_two}{target_one}{start_right}
+ \end{rxnscheme}
+\end{beispiel}
+
+\end{document} \ No newline at end of file