The photochemistry of carbenium ions and related species

113Remarkable strides have been made in recent years in the study of carbenium ions.^{1, 2} While a variety of reasons lie behind this expansion of knowledge, it has been particularly helped by the development of non-nucleophilic super acid media which has allowed for the widespread preparation and characterization of carbocations as long lived species.³ Indeed, techniques for the isolation of carbenium ions have developed sufficiently that many …