Mein LaTeX-Forum

\documentclass[12pt]{article}
\usepackage[ngerman]{babel}
\usepackage{chemfig}
\usepackage{chemformula}
\setatomsep{1.3em}
\begin{document}
\begin{equation*}
\chemnameinit{\chemfig{*6(-=N-(-SnBu_3)=-=)}}
\schemestart
\chemname{\chemfig{*6(-(-Br)=N-=(-Br)-=)}}{1}
\arrow{0}[,0.3]\+\arrow{0}[,0]
\chemname{\chemfig{*6(-=N-(-SnBu_3)=-=)}}{2}
\arrow{->[Pd(PPh$_3$)$_4$, Toluol][120°C, 24h]}[0,2.3]
\chemname{\chemfig{*6(-(-*6(-=-(-Br)=-N=))=N-=-=)}}{3}
\schemestop
\chemnameinit{}
\end{equation*}
\end{document}
 

\documentclass[12pt]{article}
\usepackage[ngerman]{babel}

\usepackage{chemfig}
\usepackage{chemformula}
\usepackage{chemnum}
\usepackage{siunitx}
\setatomsep{1.3em}

\begin{document}

\cmpd*{bla,blub,blubber}

\begin{center}
  \schemestart
    \chemfig{*6(-(-Br)=N-=(-Br)-=)}
    \arrow(bla--){0}[,0]
    \+
    \arrow{0}[,0]
    \chemfig{*6(-=N-(-SnBu_3)=-=)}
    \arrow(blub--blubber){->[\ch{Pd(PPh3)4}, Toluol][\SI{120}{\celsius}, \SI{24}{\hour}]}[0,2.3]
    \chemfig{*6(-(-*6(-=-(-Br)=-N=))=N-=-=)}
  \schemestop
  \chemmove{
    \path (blubber.south) ++(0,-.4) node (blubbername) {\cmpd{blubber}} ;
    \node at (bla|-blubbername)  {\cmpd{bla}} ;
    \node at (blub|-blubbername) {\cmpd{blub}} ;
  }
\end{center}

\end{document}

\begin{tikzpicture}[remember picture, overlay]...\end{tikzpicture}