An Ethylene Complex of Vanadium: Synthesis, Structure, and Reactivity of Cyclopentadienylbis(trimethylphosphine)(ethylene)vanadium(I)

摘要

Although olefin complexes of the early transition metals are frequently named as intermediates in catalytic reactions such as olefin polymerization and hydrogenation, very few complexes have actually been isolated, especially for the 3d-metals. For Ti the sole representative of this class of compounds is (η-C5Me5)2Ti(ethylene), while for V only two compounds are fully characterized: Cp2V(EtO2CCH=CHCO2Et) and V(CO)4[PPh2(2-alkenylphenyl)], the latter stabilized by the chelate effect. Here we wish to report a simple olefin complex of V(I), CpV(η2-ethylene)(PMe3)2, with some aspects of its reactivity.