Electron movement between compounds in reaction schemes

Question

I tried to draw some reaction schemes with some electron movements using the chemfig macros.

Problem is: I can draw every electron movement but in schemes only inside a certain compound of the reaction. If the nodes for the drawn arrow are in different compounds the arrow appears anywhere else but where I want it to. Same happens if the \chemmove-order is posted after a compound-differing arrow. Meaning it looks like the nodes get somehow "spoiled" once there is an arrow slicing compounds between the nodes and the \chemmove part.

Here are some examples.

This works:

\documentclass{article}

\usepackage{chemfig}
\usetikzlibrary{decorations}

\usepackage{chemmacros}
\begin{document}
\schemestart
\setchemrel{}{}{8em}
\chemfig{R-[:30](-[:-30,.25,,,draw=none]@{fp}\fplus)=^[:90]O}
\chemrel[\chemfig{*6(-=-=-=[@{b}])}][]{<>}
\schemestop
\chemmove{
\draw[->,red,shorten >=3pt, shorten <=3pt]
(b) .. controls +(-120:8mm) and +(-90:8mm) .. (fp) ;
}

But this doesn't:

\documentclass{article}

\usepackage{chemfig}
\usetikzlibrary{decorations}

\usepackage{chemmacros}
\begin{document}
\schemestart
\chemfig{R-[:30](-[:-30,.25,,,draw=none]@{fp}\fplus)=^[:90]O}
\arrow{<=>[*{0}\chemfig{*6(-=-=-=[@{b}])}]}[,1.5]
\schemestop
\chemmove{
\draw[->,red,shorten >=3pt, shorten <=3pt]
(b) .. controls +(-120:8mm) and +(-90:8mm) .. (fp) ;
}
\end{document}

I tried to work around it by using \chemrel instead of \arrow but this makes alignments horrible.

Answer 1

This problem appears when you use a compilation over PS to PDF. If you want to make reaction schemes using \usepackage{chemfig} you should compile with pdflatex (LaTex=>PDF).

Answer 2

Another solution (not very nice) would be to manually adjust all the offsets. This should work also if compiled over PS to PDF:

\documentclass{article}

\usepackage{chemmacros}
\usepackage{chemfig}
\usetikzlibrary{decorations}

\begin{document}

\schemestart
\chemfig{R-[:30](-[:-30,.25,,,draw=none]@{fp}\fplus)=^[:90]O}
\arrow(.340--){<=>[*{0}\chemfig{*6(-=-=-=[@{b}])}]}[,1.5]
\schemestop
\chemmove[->,red,shorten <=3pt,shorten >=3pt]{
\draw([yshift=40pt,xshift=20pt]fp.190)..controls+(-95:8mm)and+(-90:8mm)..([yshift=-4pt,xshift=35pt]b);}

\end{document}