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4

You can load the TikZ-library arrows and use the arrow tips left to and right to. Here's a quick example: \documentclass{article} \usepackage{chemfig} \setatomsep{1.8em} \usetikzlibrary{arrows} \begin{document} \schemestart \chemfig{Cl|@{Cl}\Lewis{0.,\strut}} % a long invisible bond should suffice but this demonstrates % that also scheme nodes can ...

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Your code is missing an opening brace for the \parbox and a \fi in the arrow definition. After adding those I changed the definition of the arrow as follows: \makeatletter \definearrow4{s>}{% \ifx\@empty#3\@empty \expandafter\draw\expandafter[\CF@arrow@current@style,-CF@full] \CF@arrow@start@node)--(\CF@arrow@end@node);% \else ...

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chemfig provides the command \chemname{<molecule>}{<name>} for writing a name below a molecule. It has an optional argument for the vertical offset and if the molecules have a different depth possibilities are provided to align the names anyway. This is described with examples in section 12 Writing a name under a molecule in chemfig's manual. ...

2

I know Clemens loves \arrow{0} but his solution sounds complicated to me. Why don't you use \schemestart...\schemestop inside \chemname, which seems more natural? \documentclass{article} \usepackage{chemfig} \begin{document} \schemestart \chemname{% \schemestart \chemfig{R-[:30](=[:90]O)-[:-30]R} \arrow{0}[,.5] ...

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If you place the first two compounds in a \subscheme{...} the whole subscheme gets a unique name that you can refer to in an arrow using the \arrow{@<name>--) syntax: \documentclass{article} \usepackage{chemfig} \begin{document} % uncomment to see the names: % schemedebug{true} \schemestart \subscheme{ \chemfig{R-[:30](=[:90]O)-[:-30]R} ...

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Since compounds are per default centered with respect to arrow in chemfig's schemes I usually use an invisible arrow (type 0) with length 0 (\arrow{0}[,0], the second optional argument scales the arrow relative to the basic length, the “compoundsep”) to center compounds: \documentclass{article} \usepackage{chemfig,chemmacros} \begin{document} ...

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