Titanium and zirconium complexes with novel phenoxy-phosphinimine ligands

Titanium and zirconium complexes with aminoiminophosphorane ligands

“…(2) 2.3640(9) 2.3162 (19) Bond angles N(Ph)(1)-Ti-N(Ph) (2) 93.78(14) -N(t-Bu)(1)-Ti-N(t-Bu) (2) 164.19 (15) 112.09(19) P(1)-Ti-P (2) 119.76(4) 94.66(7) Cl(1)-Ti-Cl (2) 86.90 (5) 93.19 (8) The two N(t-Bu) atoms are situated in 1.052 and −0.405 phosphinimide complexes were also observed by Stephan and coworkers. 22,23 We have also reported a series of titanium and zirconium phenoxy-phosphinimide complexes, 24 and these complexes were inactive for ethylene polymerization at atmospheric pressure, but were highly active under ca. 0.6 MPa ethylene pressure.…”

Multiple intramolecular hydrogen bonds in 2,4-di-tert-butyl-6-[N-(2,6-diisopropylphenyl)-P,P-diphenylphosphorimidoyl]phenol

“…At the same time, Fujita and co-workers (Mitani et al, 2002(Mitani et al, , 2003 developed a series of group IV metal complexes containing bis(phenoxyimine) ligands, and these complexes have proved to be excellent precatalysts for olefin polymerization. Subsequently, Zhang and co-workers (Qi et al, 2005;Qi & Zhang, 2006) reported that group IV metal complexes with phenoxy-phosphinimine ligands reacted similarly. Intrigued by the possibility that increasing the bulk of the N-containing substituents could improve catalytic activity, we investigated the use of the title compound, (I), containing the bulky 2,6-diisopropylphenyl group on atom N1 and tert-butyl groups on the phenol unit.…”

Nickel Complexes Featuring Iminophosphorane–Phenoxide Ligands for Catalytic Ethylene Dimerization

“…■ RESULTS AND DISCUSSION Some years ago, Zhang and co-workers 15 synthesized such bidentate phenoxide−iminophosphorane ligands to prepare titanium and zirconium complexes. As they employed a synthesis based on the Staudinger reaction requiring an azide, only phenyl and trimethylsilyl derivatives were reported.…”