C4 Cumulene and the Corresponding Air-Stable Radical Cation and Dication

摘要

A neutral C4 cumulene 1 that includes a cyclic alkyl(amino) carbene (cAAC), its air-stable radical cation 1~(·+), and dication 1~(2+) have been synthesized. The redox property of I~(·+) was studied by cyclic voltammetry. EPR and theoretical calculations show that the unpaired electron in 1~(·+) is mainly delocalized over the central C4 backbone. The commercially available CBr4 is utilized as a source of dicarbon in the cumulene synthesis.