Synthesis and reactions of lactam sulfonium salts with a sulfonio bridgehead. Part 1. 4,4a,5,6-Tetrahydro-5-oxo-1H-thiopyrano[1,2-a]-1,4-be nzothiazinium perchlorates
Synthesis and reactions of lactam sulfonium salts with a sulfonio bridgehead. Part 1. 4,4a,5,6-Tetrahydro-5-oxo-1H-thiopyrano[1,2-a]-1,4-be nzothiazinium perchlorates