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標題: Reactions of 4-methylidene-bis(1-phenyl-3-methylpyrazol-5-one) with trimethylaluminum: Synthesis, structure and catalysis for the ring-opening polymerization of epsilon-caprolactone
作者: Tsai, C.Y.
Li, C.Y.
Lin, C.H.
Huang, B.H.
Ko, B.T.
關鍵字: Aluminum complex;Catalyst;O,O-bidentate;Ring-opening polymerization;epsilon-caprolactone;chain-end control;l-lactide;single-site;immortal polymerization;efficient catalysts;cyclic esters;rac-lactide;living polymerization;aluminum complexes;yttrium alkoxides
Project: Inorganic Chemistry Communications
期刊/報告no:: Inorganic Chemistry Communications, Volume 14, Issue 1, Page(s) 271-275.
Aluminum complexes bearing ligand O,O-bidentate dipyrazolate are synthesized and structurally characterized. The reaction of 4-methylidene-bis(1-phenyl-3-methylpyrazol-5-one) (MBP-H) with AlMe(3) (1.2 molar equiv) in toluene yields [(MBP)AlMe(2)] (1) as the four-coordinate monomeric aluminum complex. Tri-adduct complex [Al(MBP)(3)] (2) results from treatment of AlMe(3) with MBP-H (3 molar equiv) in toluene in a high yield. In the presence of 9-anthracenemethanol, mono-adduct aluminum complex 1 catalyzes efficiently the ring-opening polymerization of epsilon-caprolactone (epsilon-CL) in a controlled manner, yielding PCLs with the expected molecular weights and narrow polydispersity indices (PDIs). (C) 2010 Elsevier B.V. All rights reserved.
ISSN: 1387-7003
DOI: 10.1016/j.inoche.2010.11.012
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