The Hinsberg reaction (interaction between an α-diketone and a dialkyl thiodiacetate) has been used to prepare a series of 3,4-disubstituted thiophen-2-carboxylates and -2,5-dicarboxylates.
D. J. Chadwick, J. Chambers, G. D. Meakins and R. L. Snowden, J. Chem. Soc., Perkin Trans. 1, 1972, 2079 DOI: 10.1039/P19720002079
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