Electron spin resonance studies. Part 51. Aliphatic and aromatic sulphinyl radicals

Abstract

A variety of sulphinyl radicals (RSO·, ArSO·) have been prepared by the reaction between the hydroxyl radical and both thiols and disulphides and by the photolysis of sulphinyl chlorides. The e.s.r. parameters of the aromatic derivatives show that these are π-type species, with extensive delocalisation of the unpaired electron on to the aromatic ring. Typical aliphatic sulphinyl radicals have g ca. 2.011 and a(β-H) in the range 0.8–1.1 mT; some of these radicals show linewidth alternation associated with conformational interconversion, and a conformational analysis is presented.