138997-60-1Relevant academic research and scientific papers
Organometallic dioxotungsten(VI) complexes of the hydrotris(3,5-dimethyl-1-pyrazolyl)borate ligand
Eagle, Aston A.,Young, Charles G.,Tiekink, Edward R. T.
, p. 2934 - 2938 (1992)
Reaction of WO2Cl2 with K{HB(Me2pz)3} [HB-(Me2pz)3- = hydrotris(3,5-dimethyl-1-pyrazolyl)borate anion] in N,N-dimethylformamide produces cis-{HB-(Me2pz)3}WO2Cl (1), which reacts with Grignard reagents in tetrahydrofuran to yield the organometallic dioxo-W(VI) complexes cis-{HB(Me2pz)3}WO2(R) (R = Me (2), Et (3), CH2Ph (4). Ph (5)). The X-ray structures of 3 and 5 reveal that the monomerlc complexes possess distorted-octahedral coordination spheres composed of a facially tridentate HB(Me2pz)3- ligand, two terminal oxo ligands, and an n1-hydrocarbyl group.
Progress toward new catalysts for acyclic diene metathesis (ADMET) polymerization reactions
Blosch, Laura L.,Gamble, A. Scott,Boncella, James M.
, p. 229 - 238 (1992)
The compounds Tp′W(CHR)(E)X (Tp′ = hydridotris(3,5-dimethylpyrazolyl)borate; R = CMe3, Ph; E = O, NPh; X = Cl, Br), 4a-c, have been synthesized by reaction of Tp′W(CR)X2 (R = CMe3, X = Cl; R = Ph, X = Br), 3a,b, with neutral alumina or aniline. Compounds 3a,b and 4a-c are air stable and thermally stable to >100°C in the solid state. When combined with 1 equivalent of AlCl3, Tp′W(CHPh)(NPh)Br, 4c, catalyzes the acyclic diene metathesis (ADMET) oligomerization of 1,9-decadiene, giving a mixture of 1,9,17-octadecatriene, 1,9,17,25-hexadodecatetraene and ethylene ('30% conversion). The new alkylidene complex, 4a, is an efficient ring-opening metathesis polymerization (ROMP) catalyst in the presence of AlCl3 as a co-catalyst.
