Substituted Cyclopropenium Salts - Photochemical and Thermal Reactions - Mechanistic Investigations

Cyclopropenium salts have attracted considerable attention since they represent the smallest two-rr-electron Huckel aromatic systems. Since the first cyclopropenium ion, triphenylcyclopropenium (TPCP), was 4 numerous others have been 5 and their reactions have received considerable 6 The only report on the photochemistry of triphenylcyclopropenium is that of van 7 who reported that photolysis of the bromide in concentrated sulfuric acid produced hexaphenylbenzene.