Arrows in Chemfig User-Package - Resolve Too Large Arrows

Question

I am trying to use the chemfig user-package. This is the code I am using:
begin{figure}[htb!]
centering
chemfig{R-CH=CH_2 -> C(-[3]H)(-[5]H)=C(-[1]H)(-[7]R) -> -C(-[2]H)(-[6]H)-C(-[2]H)(-[6]R)-}
caption{Vinylgruppe mit allgemeinem Rest R}
label{Vinylgruppe}
end{figure}

I am using the figure environment in order to point to the figure with autoref{Vinylgruppe}
This gives me the following result:

I would like to get smaller, more elegant reaction arrows. Does someone know how to do this?
Thank you!

Marijn · Accepted Answer

In chemfig arrows are supposed to be drawn with the arrow command. Each molecule is represented in a separate chemfig command and the arrows are placed in between. You also need schemestart and schemestop commands around the reaction.
MWE:
documentclass{article}
usepackage{chemfig}
begin{document}
begin{figure}[htb!]
centering
schemestart
chemfig{R-CH=CH_2} arrow chemfig{C(-[3]H)(-[5]H)=C(-[1]H)(-[7]R)} arrow chemfig{-C(-[2]H)(-[6]H)-C(-[2]H)(-[6]R)-}
schemestop
caption{Vinylgruppe mit allgemeinem Rest R}
label{Vinylgruppe}
end{figure}
end{document}

Result:

For more information and examples see the chemfig manual, specifically the section on reaction schemes starting from page 49.

Arrows in Chemfig User-Package - Resolve Too Large Arrows

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