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The treatment of tert-alkyl phenyl thioketones with Lawesson’s reagent (LR) gave two diastereomeric 1,3,2-dithiaphosphetane 2-sulfides in high yields. The structure of one of the major diastereomers was determined by X-ray crystallography. The reaction of 2-adamantanethione with LR yielded the corresponding spiro-1,3,2-dithiaphosphetane 2-sulfide derivative in 87% yield.
Oxidation of cis-3,5-di-tert-alkyl-3,5-diphenyl-1,2,4-trithiolane with an excess amount of dimethyldioxirane gave the 1,2-dioxide, a vic-disulfoxide, and it was verified that the 1,2-dioxide was formed specifically from one of two stereoisomeric monoxides. The structures of the monoxides and the 1,2-dioxide were determined by X-ray crystallography.
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