SCHEDULED MAINTENANCE
The reagent generated in situ using NaHFe(CO)4 and MeI in THF, on reaction with alkynes followed by CuCl2 oxidation, gives the corresponding cyclobutenediones in moderate yields (27–42%) in addition to the corresponding α,β-unsaturated carboxylic acids (10–22%).
M. Periasamy, U. Radhakrishnan, J. Brunet, R. Chauvin and A. W. El Zaizi, Chem. Commun., 1996, 1499 DOI: 10.1039/CC9960001499
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