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Reactions of 4-methylidene-bis(1-phenyl-3-methylpyrazol-5-one) with trimethylaluminum: Synthesis, structure and catalysis for the ring-opening polymerization of ε-caprolactone
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Reactions of 4-methylidene-bis(1-phenyl-3-methylpyrazol-5-one) with trimethylaluminum: Synthesis, structure and catalysis for the ring-opening polymerization of ε-caprolactone

Chen-Yen Tsai, Chen-Yu Li, Chia-Her Lin, Bor-Hunn Huang 和 Bao-Tsan Ko
Inorganic Chemistry Communications, 卷.14(1), 頁碼.271-275
01/2011
DOI: https://doi.org/10.1016/j.inoche.2010.11.012

摘要

ε-caprolactone Aluminum complex Catalyst O-O-bidentate Ring-opening polymerization Physical and Theoretical Chemistry Inorganic Chemistry Materials Chemistry
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 ε-caprolactone (ε-CL) in a controlled manner, yielding PCLs with the expected molecular weights and narrow polydispersity indices (PDIs). © 2010 Elsevier B.V. All rights reserved.

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