The reaction of diphenylacetylene with µ-1,2-[3,3-bis(methoxycarbonyl)-4-phenyl-1-pyrazoline]-hexa-carbonyldi-iron gives tetraphenylcyclobutadiene tri-carbonyliron; possible intermediates have been isolated, and the structure of the initial cycloadduct has been determined by X-ray analysis.
C. Krüger and H. Kisch, J. Chem. Soc., Chem. Commun., 1975, 65 DOI: 10.1039/C39750000065
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