Extended radical cation of diphenyl disulfide and oxidative cyclization on a pentasil zeolite: an EPR study
Abstract
Incorporation of diphenyl disulfide (1) into a pentasil zeolite (Na-ZSM5) results in the formation of the extended radical cation, 1˙+, as well as thianthrenium radical cation (2˙+) formed by oxidative cyclization. The stabilization of 1˙+ on the internal surfaces of the zeolite is unprecedented because in solution it is converted spontaneously into 2˙+. A mechanism for the conversion of 1˙+ to 2˙+ consistent with processes observed on the internal surfaces of the zeolite is proposed.