13 C and 1H n.m.r. evidence has been obtained for the formation of olefin π-complexes of [Co(CN)4]3– with diethyl maleate (1) and fumarate (2) and disodium maleate (3) and fumarate (4); the complex of (1) isomerises to that of (2) probably via a σ-complex of the carbanion (7).
T. Funabiki, J. Chem. Soc., Chem. Commun., 1979, 1116 DOI: 10.1039/C39790001116
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