A mechanism for the Rh-catalysed cyclization of alkynoic acids to alkylidene lactones which accounts for the formation of Z-isomers only, is presneted with the structures of Ir cis-hydrido-carboxylate and cis-hydrido-σ-vinyl model intermediates.
T. B. Marder, D. M.-T. Chan, W. C. Fultz, J. C. Calabrese and D. Milstein, J. Chem. Soc., Chem. Commun., 1987, 1885 DOI: 10.1039/C39870001885
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