Abstract

Abstract Phosphinothioylidenes were generated by the reaction of phosphonothioic dichlorides with magnesium. Reactions of phosphinothioylidenes with cis- and trans-stilbene oxides gave 1,3,2-oxathiaphospholane 2-sulfide derivatives (6, 7, 9, and 11) stereospecifically, except for the reaction of phenylphosphinothioylidene with trans-stilbene oxide, along with cis- and/or trans-stilbenes. The formation mechanisms, which involve phenylphosphinothioylidene coordinated by the ethereal oxygen atom, and the conformation of 1,3,2-oxathiaphospholane 2-sulfides were discussed.

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