Titanium, zirconium and hafnium complexes bearing amino-benzotriazole phenolate ligands as efficient catalysts for ring-opening polymerization of lactides

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Title:	Titanium, zirconium and hafnium complexes bearing amino-benzotriazole phenolate ligands as efficient catalysts for ring-opening polymerization of lactides
Authors:	Yu, CJ (Yu, Chia-Jung) Li, CY (Li, Chen-Yu) Tsai, CY (Tsai, Chen-Yen) Ko, BT (Ko, Bao-Tsan)
Contributors:	化學系
Keywords:	Hafnium complex Catalyst Amino-benzotriazole phenolate ligand Ring-opening polymerization
Date:	2019-11
Issue Date:	2019-12-13 10:30:04 (UTC+8)
Abstract:	Group 4 catalysts incorporated in 2-(2H-benzotriazol-2-yl)-4-methyl-6-(morpholinomethyl)phenolate ligand ((BTP)-B-C1MO) were synthesized and structurally characterized. The reaction of Ti((OPr)-Pr-t)(4) or M((OPr)-Pr-t)(4)((PrOH)-Pr-t) (M = Zr, Hf) with (BTP)-B-C1MO-H (2.0 M equiv.) in toluene produced the hexa-coordinated bis-adduct metal complex [((BTP)-B-C1MO)(2)M((OPr)-Pr-t)(2)] (M = Ti for 1, Zr for 2 and Hf for 3). Experimental results indicate that hafnium complex 3 displayed the higher catalytic activity than those of (BTP)-B-C1MO-featuring complexes 1 and 2 for the controlled L-LA polymerization. Hafnium alkoxide 3 catalyzes the ring-opening polymerization effectively not only in a "controlled" fashion but also an "immortal" manner, giving the corresponding polymers with the expected molecular weights and narrow molecular weight distributions.
Relation:	INORGANIC CHEMISTRY COMMUNICATIONS 卷冊: 109 文獻號碼: UNSP 107561
Appears in Collections:	[Department of Chemistry & Graduate Institute of Applied Chemistry ] journal articles

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