The tetraphenylcyclobutadiene derivative C5H5Mo(CO)C4Ph4Cl reacts with Me3CMgCl in diethyl ether to give yellow crystalline relatively air-stable C5H5Mo(CO)C4Ph4H, the first example of a cyclobutadiene–metal complex with a metal–hydrogen bond.
R. B. King and A. Efraty, J. Chem. Soc. D, 1970, 1370 DOI: 10.1039/C29700001370
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