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Reactions of (E)-N-[2-(benzyliminomethyl)phenyl]-2,6-diisopropylaniline with diethylzinc: Synthesis, characterization and catalytic studies for ring-opening polymerization of ε-caprolactone
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Reactions of (E)-N-[2-(benzyliminomethyl)phenyl]-2,6-diisopropylaniline with diethylzinc: Synthesis, characterization and catalytic studies for ring-opening polymerization of ε-caprolactone

Chao-Hsiang Wang, Chen-Yu Li, Chia-Her Lin, Yi-Chang Liu 和 Bao-Tsan Ko
Inorganic Chemistry Communications, 卷.14(9), 頁碼.1456-1460
09/2011
DOI: https://doi.org/10.1016/j.inoche.2011.05.046

摘要

ε-caprolactone Anilido-aldimine Catalyst NN-bidentate Ring-opening polymerization Zinc complex Physical and Theoretical Chemistry Inorganic Chemistry Materials Chemistry
Zinc complexes supported by NN-bidentate AA Bn ligand (AA Bn -H = (E)-N-[2-(benzyliminomethyl)phenyl]-2,6-diisopropylaniline) are synthesized and fully characterized. The reaction of diethyl zinc (ZnEt 2 ) with AA Bn -H (1.1 mol equiv) yields three-coordinated mono-adduct zinc complex [(AA Bn )ZnEt] (1). However, treatment of AA Bn -H with ZnEt 2 in the same stoichiometric proportion in the presence of 4-dimethylaminopyridine (DMAP, one equiv) affords [(AA Bn )Zn(DMAP)Et] (2) as the tetra-coordinated monomeric zinc complex. Bis-adduct complex [(AA Bn ) 2 Zn] (3) results from treatment of ZnEt 2 with AA Bn -H (two equiv) in refluxing toluene in high yield. Complexes 1 and 3 are efficient catalysts for the ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) in the presence of alcohol. The "controlled" character of Zn complex 1 also enabled preparation of the PEG-b-PCL copolymer. © 2011 Elsevier B.V. All rights reserved.

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