Cyclopentadienylization of pentafulvenes with stannyl- and nitrosyl-carbonylvanadium complexes

Article abstract of DOI:10.1016/0022-328X(88)80397-8

The complexes R3SnV(CO)5PPh3 and R3SnV(CO)6 (R = Ph, Et, n-Bu, CH2Ph), for which an improved synthesis is described, react with pentafulvenes C5H4CZ2 to give ring-substituted cyclopentadienyl (Cp) or fulvene (Fv) complexes.Less polar fulvenes from alkyl-Cp complexes (Z2 = Ph2 and (p-substituted Ph)2) or alkenyl-Cp complexes (Z2 = Me2, (CH2)4, (CH2)5) with the elimination of the stannyl ligand, while the reaction with polar fulvenes (Z2 = H, NMe2; (NMe2)2 and S(CH2)2S) gives the Fv complexes C5H4CZ2V(CO)3SnR3 with the stannyl ligand still coordinated to vanadium.A Fv complex, V(NO)(CO)2C5H4CHNMe2, is also obtained from the reaction of V(NO)(CO)5 with dimethylaminofulvene.The IR, 1H, 13C and 51V NMR data shown that the dipolar (i.E. the h⁵-cyclopentadienyloidal) resonance structure predominates in all but the dimercaptofulvene complex.