The 1,2,4,5-tetrathiane (3), readily formed from amido ester (2) and disulphur dichloride, undergoes immediate reaction with potassium hydroxide in ethanol at room temperature to form sulphur and the maleimide salt (6) which is characterised as its S-benzyl and S-methyl (4) derivatives; a mechanism is proposed for this mild carbon–carbon bond forming desulphurisation reaction.
R. M. Bannister and C. W. Rees, J. Chem. Soc., Perkin Trans. 1, 1989, 1699 DOI: 10.1039/P19890001699
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