Diastereomeric transformations in the series of 3-cyano-2-oxo-1,2-thiaphosphorinanes

A mechanism of mutual diastereomeric transformations in the series of 3-cyano-2-oxo-1,2-thiaphosphorinanes was suggested, which is based on the elimination–attachment of a rather acidic hydrogen atom at the 3-position of the heterocycle.