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\documentclass{article}

\usepackage{chemfig}
\usepackage{chemformula}
\usepackage{chemmacros}

\providecommand\IfChemCompatibilityT[3]{}

\IfChemCompatibilityT{>=}{5.0}{
  \usechemmodule{orbital}
}

\begin{document}

\chemsetup[orbital]{overlay, p/color = black!30}
\setbondoffset{0pt}

\chemfig{
  -[:-54,,,,draw=none]\orbital{p}
  -[:18,,,,draw=none]\orbital{p}
  -[:90,,,,draw=none]\orbital{p}
  -[:162,,,,draw=none]\orbital{p}
  -[:234,,,,draw=none]\orbital{p}
  -[:180,,,,draw=none]-[:0,,,,draw=none]
  N([:-180]-H)*5(-C(-H)-C(-H)-C(-H)-C(-H)-)
}

\end{document}

\documentclass{article}
\usepackage{tikz}
\usepackage{chemfig}
\usepackage{chemformula}
\usepackage{chemmacros}
\begin{figure}
\chemsetup[orbital]{overlay, p/color = black!30}
\setbondoffset{0pt}%sorgt dafür, dass zwischen den Bindungen keine Lücken sind
\chemfig{\orbital{p}N([:-180]-H)*5(-\orbital{p}C(-H)-\orbital{p}C(-H)-\orbital{p}C(-H)-\orbital{p}C(-H)-)}
\end{figure}
\end{document}

\documentclass{article}
\usepackage{chemmacros}
\usepackage{chemfig}
\begin{document}

\setatomsep{1.4em}
\schemestart
  \chemfig{H-[:30](=[:90]@{AA}\lewis{13,O})-[:-30]H}
  \+
  \chemfig{@{BB}H^\fplus}
\schemestop
\chemmove{
  \draw[->,shorten >=3pt, shorten <=4pt]
    (AA)..controls+(45:1.5cm)and+(60:0.7cm)..(BB);
}

\end{document}

\documentclass{article}
\usepackage{chemfig}
\usepackage{chemmacros}
\begin{document}
\schemestart
\setatomsep{1.4em}
\chemfig{H-[:30](=[:90]@{AA}\lewis{13,O})-[:-30]H}\+
\chemfig{@{BB}\chemabove{H}{\hspace{3.5mm}\oplus}}
\chemmove{\draw[->](AA)..controls+(45:1.5cm)and+(60:0.7cm)..(BB);}
\schemestop
\end{document}

\documentclass{article}

% was mir meine Kristallkugel verrät:
\usepackage{chemfig}
\usepackage{chemnum}

\begin{document}

\schemestart
  \chemname{\chemfig{MolekülA}}{\cmpd{8}}
  \arrow{->[\chemname{\small
      \chemfig{*6(-=-(-[:30]=[:330]X)=-(-[:150]=[:210]X)=)}}{\cmpd{12}}][{\small
      EtOH}]}[,2.0]
  \chemnameinit{}
  \chemname{\chemfig{MolekülB}}{\cmpd{13}}
\schemestop

\end{document}