2-Oxacyclopentenylidene complexes of chromium and tungsten are formed in a one pot reaction from lithiated prop-2-ynylic ether and the metal carbonyl; the chromium complex undergoes annulation by tolan to give an acyl hydroquinone skeleton.
J. Christoffers and K. H. Dötz, J. Chem. Soc., Chem. Commun., 1993, 1811 DOI: 10.1039/C39930001811
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