Abstract Bromination of 1-arylbut-2-enes in the system [HBr or NaBr (KBr)-HX]-H 2 O 2 (or NaOCl) under relatively mild conditions leads to electrophilic addition of bromine or hypobromous acid at the side-chain double bond. Under more severe conditions, the process is accompanied by bromination of the aromatic ring. Treatment of the title compounds with peroxy acids (RCOOH-H 2 O 2) gives the corresponding epoxy ...
