Under typical copper-catalyzed hydroboration conditions, β-(trifluoromethyl)styrenes demonstrate unusal reactivities by forming difluoromethylated alkenes via a net protodefluorination process. This is also distinct from trifluoromethyl alkenes with alkyl substituents where defluoroborylation products predominate.
Keywords: copper catalysis; defluoroborylation; difluoromethyl alkenes; hydroboration; protodefluorination.
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