Indium-Bridged Chelating Diamide Group IV Metal Olefin Polymerization Catalysts

Abstract

The group IV metal chelating diamide complex 2 has been prepared and characterized by 1 H and 13 C{ 1 H} NMR spectroscopy and single-crystal X-ray structure analysis. This complex is an active catalyst upon combining with the appropriate activator. The catalyst efficiencies, however, are considerably lower than those of Cp-based catalysts. The polydispersities of the polymers produced were found to be broader than those observed for Cp-based single-site catalytic systems.

Reversible metathesis of ammonia in an acyclic germylene–Ni0 complex

“…All other solvents were dried over activated 4 Å mol sieves and degassed prior to use. NiBr 2 ·DME, 30 NiCl 2 ·DME, 31 DippN(H)Li, 32 and PPh 2 CH 2 Li·TMEDA 33 were synthesized according to known literature procedures. All other reagents were used as received.…”

Titanium and zirconium ketimide complexes: synthesis and ethylene polymerisation catalysis

“…Carbon-, nitrogen-and oxygen-based ligands have been replacing one or both Cp ligands of metallocenes, giving rise to new classes of compounds that have a wide range of activities towards the polymerisation of olefins [1]. Nitrogen-based ligands have, in particular, been given much attention over the past decade and, as a result, new support moieties for Group 4 complexes, many of which are active catalysts in olefin polymerisation, have been reported [2][3][4][5][6][7][8][9][10][11][12].…”

Non-Cp type homogeneous catalytic systems for olefin polymerization

“…The use of longer spacer as in 11 also gives rise to high activity of 5200 kg PE/ mol cat h for ethylene polymerization [58]. Boron and indium atoms play interesting role as spacers since the compounds 12 and 13 are very active for ethylene/1-octene copolymerization [59,60]. It is worthy of mention that amide complexes of vanadium 17d [50] and chromium 18 [66] are also reported.…”

“…As an alternative spacer, various kinds of bridging units were employed as can be seen in 9-18 [48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66]. A set of McConvilleÕs analogues such as the compounds 9 and 10 where the spacer length is similar to McConvilleÕs propylene bridge but the flexibility of a spacer is reduced due to the introduction of a aromatic ring has been reported [51][52][53][54][55][56][57].…”