Reaction of dilithiated ethyl thioglycolate with bis(imidoyl chloride)s of oxalic acid afforded the first 2,3-diiminothietanes, which underwent ring expansion reactions upon treatment with ethyl thioglycolate or dimethyl acetylenedicarboxylate.
P. Langer and M. Döring, Chem. Commun., 1999, 2439 DOI: 10.1039/A906913E
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