V. Jayathirtha Rao, K. Muthuramu, and V. Ramamurthy* ... Department of Organic Chemistry, Indian Institute of Science, Bangalore, India Received July 23, 1981 ... Oxidation of di-tert-butyl thioketone (1) and 2,2,4,4-tetramethylcyclobutyl thioketone (2) by singlet oxygen yields the corresponding sulfine and ketone; in the case of 1 the sulfine is the major product, whereas in 2 it is the ketone. 1,2,3-Dioxathietane has been suggested as the precursor ...