The reactions of methyl propiolate and dimethyl acetylenedicarboxylate with CSe2 in dichloromethane at 60–65 °C under 4500–5000 atm for 10 h gave dimethoxy-carbonyl- and tetramethoxycarbonyl-substituted tetra-selenafulvalenes in good yield (ca. 85–90%).
Y. Okamato and P. S. Wojciechowski, J. Chem. Soc., Chem. Commun., 1981, 669 DOI: 10.1039/C39810000669
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