Strong evidence for thiazirines as stable intermediates at cryogenic temperatures in the photolytic formation of nitrile sulphides from arylsubstituted 1,2,3,4-thiatriazole, thiatriazole 3-oxide, and 1,3,4-oxathiazol-2-one
The photolysis of phenyl-substituted C-, N-, and S-containing heterocyclic compounds embedded in poly(vinyl chloride)(PVC) at 10–15 K has been studied. A compound believed to be phenylthiazirine was formed in each case. It is stable at 10–15 K, and on heating it rearranges to benzonitrile sulphide, which at still higher temperature decomposes to benzonitrile and sulphur.