Dimethyl 2,2-dioxido-4-phenyl-2-thiabicyclo[2,2,2]octa-5,7-diene-5,6-dicarboxylate (3) on heating gives dimethyl biphenyl-2,3-dicarboxylate (2) and sulphene, the latter being detected by trapping experiments.
J. F. King and E. G. Lewars, J. Chem. Soc., Chem. Commun., 1972, 700 DOI: 10.1039/C39720000700
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