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標題: Preparation and characterization of aluminum alkoxides and their application to ring-opening polymerization of epsilon-caprolactones
作者: Yu, T.L.
Huang, C.H.
Yang, L.F.
Ko, B.T.
Lin, C.C.
關鍵字: aluminum;alkoxide;catalyst;polymerization;caprolactone;immortal polymerizations;crystal-structures;block-copolymers;alkylaluminum;complexes;isopropoxide;derivatives;mechanism;lactide
Project: Journal of the Chinese Chemical Society
期刊/報告no:: Journal of the Chinese Chemical Society, Volume 47, Issue 6, Page(s) 1185-1190.
The reaction of 2-methoxybenzyl alcohol with one molar equiv of R2AlX in diethyl ether at 0 degreesC gives [(2-MeOC6H4CH2-mu -O)AIRX](2) (1: R = Et, X = Cl, 2: R = X = Et). In addition, 2,4-di-tert-butylphenol reacts with (Bu3Al)-Bu-1 affording a four-coordinated aluminum compound [(mu -2,4-Bu-t(2)-C6H4O)Al(Bu-i)(2)](2) (4). Single crystal X-ray structure analysis of 4 shows a C-2h-symmetry with a planar Al2O2 core. Ring-opening polymerization (ROP) of caprolactones initiated by 1, 4 and [(mu -OCH2C6H4OMe)Al(Bu-i)(2)](2) (3) is performed and polyesters with narrow molecular weight distributions were obtained from the "living" ROP of caprolactones. H-1 NMR spectroscopic studies of PCL reveal that the initiator of 1 and 3 is through the Al-OAr function, but the initiator of 4 is through the Al-Bu-i group.
ISSN: 0009-4536
Appears in Collections:化學系所

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