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|標題:||Tridentate Anilido-Aldimine Magnesium and Zinc Complexes as Efficient Catalysts for Ring-Opening Polymerization of epsilon-Caprolactone and L-Lactide||作者:||Tsai, Y.H.
|關鍵字:||anilido-aldimine;catalysts;epsilon-caprolactone;L-lactide;magnesium;polyesters;ring-opening polymerization (ROP);tridentate;zinc;single-site catalysts;chain-end control;cyclic esters;immortal;polymerization;racemic lactide;metal-complexes;rac-lactide;living;polymerization;excellent initiators;aluminum porphyrin||Project:||Journal of Polymer Science Part a-Polymer Chemistry||期刊/報告no：:||Journal of Polymer Science Part a-Polymer Chemistry, Volume 47, Issue 19, Page(s) 4927-4936.||摘要:||
A novel tridentate anilido-aldimine ligand, [o-C(6)H(4)(NHAr)-HC= NCH(2)CH(2)NMe(2)] (Ar = 2,6-(i)Pr(2)C(6)H(3), L-H, 1), has been prepared by the condensation of N, N-dimethylethylenediamine with one molar equivalent of 2-fluoro-benzaldehyde in hexane, followed by the addition of the lithium salt of diisopropylaniline in THE Magnesium (Mg) and zinc (Zn) complexes supported by the tridentate anilido-aldimine ligand have been synthesized and structurally characterized. Reaction of L-H (1) with an equivalent amount of Mg(n)Bu(2) or ZnEt(2) produces the monomeric complex [LMg(n)Bu] (2) or [LZnEt] (3), respectively. Experimental results show that complexes 2 and 3 are efficient catalysts for ring-opening polymerization of epsilon-caprolactone (CL) and L-lactide (LA) in the presence of benzyl alcohol and catalyze the polymerization of epsilon-CL and L-LA in a controlled fashion yielding polymers with a narrow polydispersity index. In both polymerizations, the activity of Mg complex 2 is higher than that of Zn complex 3, which is probably due to the higher Lewis acidity and better oxophilic nature of Mg(2+) metal. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47:4927-4936, 2009
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