Synthesis and reaction of (η5-pentamethylcyclopentadienyl)bis(allyl)tantalum(III) complexes; crystal structure of Ta(η5-C5Me5)(η3-1-phenylallyl)2

Article abstract of DOI:10.1016/0022-328X(93)80413-6

We report here the synthesis and X-ray structure of a mononuclear 16-electron (η⁵-pentamethylcyclopentadienyl)bis(allyl)-tantalum complex, Cp^*Ta(η³-PhC3H4)2 (2).Carbonylation of 2 induced the coupling reaction with phenylallyl groups bound to tantalum to give 1,6-diphenyl-1,5-hexadiene and carbonyltantalum complexes.Oxidation of 2 with one-electron oxidants, DDQ and TCNQ, gave the tantalum(IV) complexes, *Ta(PhC3H4)2>.