文献类型：期刊文献

英文题名：Aluminum complexes of bidentate phenoxy-amine ligands: Synthesis, characterization and catalysis in ring-opening polymerization of cyclic esters

作者：Wang, Yuan;Ma, Haiyan[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Lab Organometall Chem, Shanghai 200237, Peoples R China

年份：2013

卷号：731

起止页码：23

外文期刊名：JOURNAL OF ORGANOMETALLIC CHEMISTRY

收录：;EI(收录号：20131616207908);WOS:【SCI-EXPANDED(收录号:WOS:000318319300004)】；

基金：Financial supports from the National Natural Science Foundation of China (NNSFC, 20604009 and 21074032) and the Fundamental Research Funds for the Central Universities (WK0914042, WD1113011) are gratefully acknowledged.

语种：英文

外文关键词：Phenoxy-amine; Aluminum complex; Ring-opening polymerization; rac-Lactide; epsilon-Caprolactone

摘要：A series of aluminum complexes 1a-5a bearing bidentate phenoxy-amine ligands were synthesized and characterized by NMR spectroscopy and elemental analyzes. The variation of the ortho-substituent of phenoxy moiety and the amino group of the ancillary ligands has crucial influence on the stoichiometric structure of the obtained aluminum complexes. Reaction of 2-(N-benzyl-N-R-3-aminomethyl)-4-R-2-6-R-1-phenols (R-1 = Bu-t, R-2 = Me, R-3 = ethyl, 1; R-1 = R-2 = cumyl, R-3 = ethyl, 2; R-1 = R-2 = cumyl, R-3 = Bu-t, 3) with either one or half equivalent of AlMe3 exclusively afforded monoligated complexes (LAlMe2)-Al-Bu,Et (1a), (LAlMe2)-Al-Cumyl,Et (2a) and (LAlMe2)-Al-Cumyl,Bu (3a), whereas the treatment of 2-(N-benzyl-N-R-3-aminomethyl)-4,6-dichlorophenols (R-3 = ethyl, 4; R-3 = Bu-t, 5) with 0.5 equivalent of AlMe3 resulted in the formation of (L-Cl,L-Et)(2)AlMe (4a) or (L-Cl,L-Bu)(2)AlMe(HLCl,Bu) (5a) respectively. All of these aluminum methyl complexes can efficiently polymerize rac-lactide to atactic polymers and actively initiate the ring-opening polymerization of epsilon-caprolactone. (C) 2013 Elsevier B.V. All rights reserved.