The syntheses of complexes [Mo(η5-C5H5){η4-C4(CF3)4}(CO)I] and [Mo(η5-C5H5){η4-C4(CF3)4}S2CNMe2] containing a tetrakis(trifluoromethyl)cyclobutadiene ring are described; variable temperature 19F n.m.r. studies reveal the existence of high barriers to rotation of the C4 ring about the metal–ligand axis in both complexes.
J. L. Davidson, J. Chem. Soc., Chem. Commun., 1980, 113 DOI: 10.1039/C39800000113
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