Chemfig：反应机理问题：箭头位置

Question

大家好。正如大家所见，弯曲的箭头并没有像它应该的那样指向正碳，而是绕着键扭了起来。我该如何解决这个问题？提前感谢大家的回答！

\schemestart
\chemfig{@{a2}C^{\oplus}(-[:90]CH_3)(-[:180]CH_3)(-[:270]CH_3)}\chemfig{\+ @{a1}Cl^{\ominus}}\arrow{<=>}\chemfig{C(-[:0]Cl)(-[:90]CH_3)(-[:180]CH_3)(-[:270]CH_3)}
\schemestop
\chemmove{\draw(a1)..  controls +(100:5mm) and +(145:5mm)..  (a2);}

Answer 1

你应该写

\schemestart
\chemfig{@{a2}C^{\oplus}(-[:90]CH_3)(-[:180]CH_3)(-[:270]CH_3)}\chemfig{\+ @{a1}Cl^{\ominus}}
\arrow{<=>}\chemfig{C(-[:0]Cl)(-[:90]CH_3)(-[:180]CH_3)(-[:270]CH_3)}
\schemestop
\chemmove{\draw(a1)..  controls +(100:5mm) and +(45:5mm)..  (a2);}