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|Title:||Titanium isopropoxide complexes of a series of sterically demanding aryloxo based [N(2)O(2)](2-) ligands as precatalysts for ethylene polymerization|
Living Insertion Polymerization
Metal Bis(Phenolate) Catalysts
Imine Chelate Ligands
|Publisher:||ROYAL SOC CHEMISTRY|
|Citation:||DALTON TRANSACTIONS, 39(45), 11060-11068|
|Abstract:||Several titanium isopropoxide complexes [N,N'-bis(2-oxo-3-R(1)-5-R(2)-phenylmethyl)-N, N'-bis(methylene-p-R(3)-C(6)H(4))-ethylenediamine]Ti(O(i)Pr)(2) [R(1) = t-Bu, R(2) = Me, R(3) = H (1b); R(1) = R(2) = t-Bu, R(3) = H, (2b); R(1) = R(2) = Cl, R(3) = H, (3b), R(1) = t-Bu, R(2) = Me, R(3) = Cl (4b); R(1) = R(2) = t-Bu, R(3) = Cl, (5b); R(1) = R(2) = R(3) = Cl, (6b)] supported over sterically demanding aryloxy based [N(2)O(2)]H(2) ligands have been designed as precatalysts for the ethylene polymerization. Specifically, the 1b-6b complexes, when treated with methylaluminoxane (MAO) under 88 +/- 0.5 psi of ethylene at 30 degrees C for 3 h, produced polyethylene polymers of high molecular weight (M(w) = ca. 7.2-8.3 x 10(5) g mol(-1)) having broad molecular weight distribution (PDI = ca. 13.1-14.6). The 1b-6b complexes were conveniently synthesized from the direct reaction of the [N(2)O(2)]H(2) ligands, 1a-6a, with Ti(O(i)Pr)(4) in 69-86% yield.|
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