Treatment of the easily accessible (µ-butenolide)(µ-CO)Co2(CO)6 complexes with prop-2-ynylamines yields the new γ-substituted-α,β-unsaturated-γ-lactones and the known 2,4,6-octatriene-4,5-diolide isomers under atmospheric pressure in good yields.
M. Tasi, I. T. Horvath, G. D. Andreeti and G. Palyi, J. Chem. Soc., Chem. Commun., 1989, 426 DOI: 10.1039/C39890000426
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