Titanium complexes bearing benzotriazole iminophenolate ligands as efficient catalysts for ring-opening polymerization of cyclic esters

Dei Cheng Liu, Chen Yu Li, Pei Hua Lin, Jhy Der Chen, Chen Yen Tsai*, Chia Her Lin, Bao Tsan Ko

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Titanium catalysts incorporated by imino-benzotriazole phenolate (IBTP) ligands (C1NNIBTP, C1FuIBTP and C1NOIBTP) were synthesized and structurally characterized. The reaction of Ti(OiPr)4 with C1NNIBTP-H (1.0 molar equiv.) in toluene produced hexa-coordinated mono-adduct titanium complex [(C1NNIBTP)Ti(OiPr)3] (1). However, six-coordinated bis-adduct Ti complex [(C1FuIBTP)2Ti(OiPr)2] (2) or [(C1NOIBTP)2Ti(OiPr)2] (3) resulted from treatment of Ti(OiPr)4 with C1FuIBTP-H or C1NOIBTP-H in CH2Cl2 using a Ti to ligand precursor ratio of 1:2. Catalytic studies for ring-opening polymerization of ε-caprolactone (ε-CL) or L-lactide utilizing complex 1 were detailedly investigated. Titanium complex 1 was shown to effectively catalyze the ε-CL polymerization not only in a “controlled” fashion but also an “immortal” manner, giving narrowly dispersed polymers having the expected molecular weights.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalInorganic Chemistry Communication
Volume90
DOIs
Publication statusPublished - 2018 Apr
Externally publishedYes

Keywords

  • Benzotriazole iminophenolate ligand
  • Catalyst
  • Lactide
  • Ring-opening polymerization
  • Titanium complex
  • ε-caprolactone

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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