4-substituted tert-butyl phenylazocarboxylates-synthetic equivalents for the para-phenyl radical cation

Abstract

First electrophile, then radical: 4-Substituted tert-butyl phenylazocarboxylates 1 are versatile synthetic equivalents of the para-phenyl radical cation 2. The tert-butyloxycarbonylazo group enables nucleophilic substitutions to proceed under mild conditions and can later be employed for the generation of aryl radicals. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.