Oxidative Dimerization of Quinolinic Nitroxides in the Presence of Trichloro- and Trifluoro- Acetic Acid. Crystal Structures of 6,6'-bis-(1-oxide-1,2,6,8a-tetrahydroquinoline)ylidene and of 2,3-Diphenylquinoline

Article abstract of DOI:10.1016/S0040-4020(01)81875-5

Quinolinic nitroxides 1a-c react with trichloro- (TCA) and trifluoro- (TFA) acetic acid to give dimers 3a-c and 4a-c as the main products.Products 3a-c are explained as arising via the intermediate formation of the radical cation 5, which forms the final