When appropriate vinyl sulphides, which are activated by two electron-withdrawing groups at the 2-position, react with diazoalkanes they give 4-arylthio-substituted pyrazolines; these undergo accelerated thermal decomposition in which the arylthio-group migrates to the 5-position, with loss of nitrogen, to furnish exclusively the substituted allyl sulphides.
M. Hamaguchi, S. Miyazaki and T. Nagai, J. Chem. Soc., Chem. Commun., 1983, 12 DOI: 10.1039/C39830000012
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