156975-32-5Relevant academic research and scientific papers
Novel μ-methyl complexes of vanadium and their relevance to bimolecular deactivation of homogeneous imidovanadium polymerisation catalysts
Chan, Michael C. W.,Cole, Jacqueline M.,Gibson, Vernon C.,Howard, Judith A. K.
, p. 2345 - 2346 (1997)
Attempted dimethylation of [CpV(NC6H3Pri2-2,6)]Cl2 using Grignard reagents affords novel μ-methyl complexes arising by reductive dimerisation; the structure of one of these products, [CpV(NC6/su
Alkylation and reductive dimerization of half-sandwich imido vanadium dichlorides
Buijink, Jan-Karel F.,Meetsma, Auke,Teuben, Jan H.,Kooijman, Huub,Spek, Anthony L.
, p. 161 - 170 (2007/10/02)
The vanadium imido complex ArNVCl3 (2) (Ar=2,6-C6H3-(i-Pr)2) can be converted to the half-sandwich imido vanadium complex CpV(NAr)Cl2 (3) by reaction with CpSiMe3.Reaction of 3 and of CpV(N-p-tolyl)Cl2 (1) with alkylating reagents did not allow the isolation of the pure dialkyl complexes but showed extensive reduction of vanadium.Reaction of 1 with AlMe3 leads to the formation of a mixture of diamagnetic dimeric, imido-bridged complexes (CpV)2(μ-N-p-tolyl)2 MeR (R=Me or Cl), which canbbe converted to the pure chloro compound 2 (4) reaction with HCl.Dimerization is preveted when the more bulky ArN ligand is used.Alkylation of 4 with MeLi proceeds cleanly to give the methyl compound 2 (5).The molecular structures of the formally vanadium(IV) complexes 4 and 5 have been obtained, showing a planar cyclovanadazene core with a vanadium-vanadium single bond and V-Cl and V-CMe bond lengths that are characteristic of V(V) compounds.Compound 5 reacts with CO by insertion in the V-C bond, but no reaction is observed with other small unsaturated molecules or Broensted acids.The 51V NMR chemical shifts of the new complexes are reported and compared with the chemical shifts of known imido vanadium complexes.Keywords: Vanadium; Half-sandwich complexes; Imido complexes; Alkylation; Reduction
Synthesis, molecular structure, and reactivity of a half-sandwich vanadium(III) imido complex: The first vanadium (V) alkylidene
Buijink, Jan-Karel F.,Teuben, Jan H.,Kooijman, Huub,Spek, Anthony L.
, p. 2922 - 2924 (2008/10/08)
One of the trimethylphosphine ligands in CpV(NAr)(PMe3)2 (3; Ar = 2,6-C6H3-i-Pr2), obtained by magnesium reduction of CpV(NAr)Cl2 (2), can be substituted by CO, ethylene, or diphenylacetylene to give the corresponding π-acceptor (L) complex CpV(NAr)(L)-(PMe3) (L = CO, 4; L = C2H4, 5; L = PhC≡Ph, 6). 3 reacts with Ph3P=CHPh to form the first vanadium(V) alkylidene, CpV(NAr)(=CHPh)(PMe3) (7).
