Investigations of structure and conformation. Part 13. An e.s.r. study of restricted rotation and delocalization in some sulphur-substituted phenoxy-radicals

Abstract

E.s.r. spectra of some relatively stable phenoxy-radicals with para thioaryl substituents show line-width effects which indicate that there is restricted rotation around the C(phenoxy)–S bond. The barriers to rotation which have been measured (>50 kJ mol^–1) imply that in these radicals there is considerable delocalization of the unpaired electron onto sulphur.