The title reaction yields two products, dimethyl tetrachlorophthalate, by [4 + 2] cycloaddition and dimethyl 2-chloro-3-ethoxycarbonylimino-2-trichloro-2-thienylsuccinate by [6 + 2] cycloaddition. The latter structure, verified by X-ray crystallography, corrects an earlier report.
J. L. M. Dillen, O. Meth-Cohn and G. van Vurren, J. Chem. Soc., Perkin Trans. 1, 1987, 2659 DOI: 10.1039/P19870002659
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