Nachfolgend noch eine weitere angepasste Lösung. \documentclass{article} \usepackage{chemfig} \setchemfig{atom sep = 2.3em, cram width = 4.5pt } \renewcommand*\printatom[1]{\ensuremath{\mathsf{#1}}} % \begin{document} \thispagestyle{empty} \schemestart \chemfig{H_3C-C(-[:90]CH_3)(-[:-90]CH_3)-@{1}\charge{90:1pt=\:,-90:1pt=\:}{O}-[:-40]H} \arrow{0}[,0.1] + \arrow{0}[,0.25] \chemfig{@{4}\charge{0:2pt=$\scriptstyle{\oplus}$}{O}(-[:70,.9,,,line width=3pt,dash pattern=on 0.8pt off 2pt]H)(<[@{3}:110]@{2}H)-[:-90]H} \arrow{->[][--$\,\mathsf{H_2O}$][1pt][]}[,1.2,-Latex] \chemfig{H_3C-C(-[:90]CH_3)(-[:-90]CH_3)-\charge{-90:1pt=\:,90:3pt=$\scriptstyle{\oplus}$}{O}(-[:40]H)-[:-40]H} \schemestop % \chemmove{\draw[shorten >=5pt, shorten <=2pt] (2).. controls +(135:1cm)and+(90:1cm)..(1);} \chemmove{\draw[shorten >=2pt, shorten <=5pt] (3).. controls +(180:0.4cm)and+(west:.75cm)..(4);} \end{document}

Nachfolgend noch eine weitere angepasste Lösung. \documentclass{article} \usepackage{chemfig} \setchemfig{atom sep = 2.3em, cram width = 4.5pt } \renewcommand*\printatom[1]{\ensuremath{\mathsf{#1}}} % \begin{document} \thispagestyle{empty} \schemestart \chemfig{H_3C-C(-[:90]CH_3)(-[:-90]CH_3)-@{1}\charge{90:1pt=\:,-90:1pt=\:}{O}-[:-40]H} \arrow{0}[,0.1] + \arrow{0}[,0.25] \chemfig{@{4}\charge{0:2pt=$\scriptstyle{\oplus}$}{O}(-[:70,.9,,,line width=3pt,dash pattern=on 0.8pt off 2pt]H)(<[@{3}:110]@{2}H)-[:-90]H} \arrow{->[][--$\,\mathsf{H_2O}$][1pt][]}[,1.2,-Latex] \chemfig{H_3C-C(-[:90]CH_3)(-[:-90]CH_3)-\charge{-90:1pt=\:,90:3pt=$\scriptstyle{\oplus}$}{O}(-[:40]H)-[:-40]H} \schemestop % \chemmove{\draw[shorten >=5pt, shorten <=2pt] (2).. controls +(135:1cm)and+(90:1cm)..(1);} \chemmove{\draw[shorten >=2pt, shorten <=5pt] (3).. controls +(180:0.4cm)and+(west:.75cm)..(4);}+(180:0.4cm)and+(west:.75cm)..(4);} \end{document}

Nachfolgend noch eine weitere angepasste Lösung. \documentclass{article} \usepackage{chemfig} \setchemfig{atom sep = 2.3em, cram width = 4.5pt } \renewcommand*\printatom[1]{\ensuremath{\mathsf{#1}}} \begin{document} \thispagestyle{empty} \schemestart \chemfig{H_3C-C(-[:90]CH_3)(-[:-90]CH_3)-@{1}\charge{90:1pt=\:,-90:1pt=\:}{O}-[:-40]H} \arrow{0}[,0.1] + \arrow{0}[,0.25] \chemfig{@{4}\charge{0:2pt=$\scriptstyle{\oplus}$}{O}(-[:70,.9,,,line width=3pt,dash pattern=on 0.8pt off 2pt]H)(<[@{3}:110]@{2}H)-[:-90]H} \arrow{->[][--$\,\mathsf{H_2O}$][1pt][]}[,1.2,-Latex] \chemfig{H_3C-C(-[:90]CH_3)(-[:-90]CH_3)-\charge{-90:1pt=\:,90:3pt=$\scriptstyle{\oplus}$}{O}(-[:40]H)-[:-40]H} \schemestop \chemmove{\draw[shorten >=5pt, shorten <=2pt] (2).. controls +(135:1cm)and+(90:1cm)..(1);} \chemmove{\draw[shorten >=2pt, shorten <=5pt] (3).. controls +(180:0.4cm)and+(west:.75cm)..(4);}