The structure of [(C2H5)2B(pyrazolyl)2](C7H7)-(CO)2Mo shows that the molybdenum atom attains a formal 18-electron configuration by strong interaction with an α-hydrogen atom of an ethyl group (H–Mo = 1.93 Å) thus leaving four “unused”pπ electrons in the trihaptocycloheptatrienyl ring.
F. A. Cotton and V. W. Day, J. Chem. Soc., Chem. Commun., 1974, 415 DOI: 10.1039/C39740000415
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