A facile synthesis of [1‐13C]benzonitrile by bromination‐dehydrobromination of [1‐13C]1‐cyanocyclohexene

Abstract
[1‐13C]1‐Cyanocyclohexene can be bisbrominated by N‐bromosuccinimide and then aromatized by triethylamine to give [1‐13C] benzonitrile in 90% yield. This allylic bisbromination‐dehydrobromination reaction is generally applicable to the transformation of other 1‐substituted cyclohexenes into benzenoid derivatives.