p-Methoxybenzoyl[bis(p-methoxyphenyl)]methylium hexafluoroantimonate: the first isolatable carbonyl-substituted carbenium ion salt
Abstract
The title compound (p-MeOC6H4)2(p-MeOC6H4CO)C+SbF6– has been prepared as a stable crystalline salt from the corresponding chloride and silver hexafluoroantimonate; when heated in 1,2-dichloroethane this cation affords 2,3-bis-(p-methoxyphenyl)-6-methoxybenzofuran (5)via cyclization.