1

Here's a scheme in chemfig:

\documentclass{article}
\usepackage{chemfig}
    \setchemfig{scheme debug=true}
        \schemestart
        \ce{\textbf{E}}\arrow{->[][\scriptsize{\ce{CaF2, H2SO4}}]}[120]
        \ce{\textbf{F}}\arrow{->[\scriptsize{\ce{AlCl3}}]}[40]
        \ce{\textbf{B}}\arrow{-U>[*{0}\ce{H2O}][*{0}\ce{D}]}[90]
        \textbf{C}
        \arrow(@c3--){-U>[\ce{CH3OH}][\ce{D}]}[0,2]
        \ce{\textbf{G}}\arrow{->[\scriptsize{\ce{NaH}}]}
        \ce{\textbf{H}}\arrow{->[\scriptsize{\ce{H2SO4}}]}
        \ce{Na2SO4}, \ce{\textbf{K}}, \ce{\textbf{I}}
        \arrow(@c1--){->[\scriptsize{$t^o$}]} %here
        \ce{\textbf{C}}
        \schemestop
        \bigskip 
\end{document}

I need to inverse the direction of the arrow from c1 to c8 (i.e. from E to C: marked in the code). How can I make the arrow go from C to E?

1
  • 1
    I can't run your code but have you tried using <- instead of ->?
    – campa
    Jan 16 at 16:36
5

The code doesn't compile as is and not only because of the missing \begin{document}. The command \ce is from mhchem and also chemmacros is not loaded that could afford compatibility, but is needed anyway.

This works:

\documentclass{article}
\usepackage{chemfig,chemmacros}

%\setchemfig{scheme debug=true}

\begin{document}

\schemestart
  \ch{\textbf{E}}\arrow{->[][\scriptsize{\ch{CaF2, H2SO4}}]}[120]
  \ch{\textbf{F}}\arrow{->[\scriptsize{\ch{AlCl3}}]}[40]
  \ch{\textbf{B}}\arrow{-U>[*{0}\ch{H2O}][*{0}\ch{D}]}[90]
  \textbf{C}
  \arrow(@c3--){-U>[\ch{CH3OH}][\ch{D}]}[0,2]
  \ch{\textbf{G}}\arrow{->[\scriptsize{\ch{NaH}}]}
  \ch{\textbf{H}}\arrow{->[\scriptsize{\ch{H2SO4}}]}
  \ch{Na2SO4}, \ch{\textbf{K}}, \ch{\textbf{I}}
  \arrow(@c1--){<-[\scriptsize{$t^o$}]} %here
  \ch{\textbf{C}}
\schemestop

\end{document}

Note <- instead of -> for the requested direction and \ch instead of \ce.

enter image description here

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