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, Bao Tsan Ko*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Zinc complexes supported by NN-bidentate AABn 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 AABn-H (1.1 mol equiv) yields three-coordinated mono-adduct zinc complex [(AABn)ZnEt] (1). However, treatment of AABn-H with ZnEt2 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 [(AABn)2Zn] (3) results from treatment of ZnEt2 with AABn-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.

Original languageEnglish
Pages (from-to)1456-1460
Number of pages5
JournalInorganic Chemistry Communication
Volume14
Issue number9
DOIs
Publication statusPublished - 2011 Sep
Externally publishedYes

Keywords

  • ε-caprolactone
  • Anilido-aldimine
  • Catalyst
  • NN-bidentate
  • Ring-opening polymerization
  • Zinc complex

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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