Abstract
The reaction of CrCl 2(PEt 3) x with potassium pentadienide leads to a compound with the stoichiometry of a phosphine adduct of Cr(C 5H 7) 2, “Cr(C 5H 7) 2PEt 3”; however, dimerization through pentadienyl—pentadienyl coupling actually leads to a Cr I species. Its structure has been determined and suggests little if any contribution from an enediyl Cr III resonance form. The structure of the known Cr(2,4-C 7H 11)(CH 3)(dmpe) has also been determined to allow comparison with the former compound.
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