Oxidation of trans-3, 5-di-tert-butyl-3, 5-diphenyl-1, 2, 4-trithiolane with dimethyldioxirane (DMD) or m-chloroperbenzoic acid (MCPBA) gave two stereoisomeric (1 S*, 3 S*, 5 S*)-and (1 R*, 3 S*, 5 S*)-1-oxides (16 and 17, respectively). Oxidation of 16 with DMD gave the (1 S*, 2 R*, 3 S*, 5 S*)-1, 2-dioxide (18) and the 1, 1-dioxide 19, and that of 17 yielded the (1 R*, 2 R*, 3 S*, 5 S*)-1, 2-dioxide (20) mainly along with 18 and 19. The structures of the 1, ...