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Titanium complexes bearing benzotriazole iminophenolate ligands as efficient catalysts for ring-opening polymerization of cyclic esters
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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 和 Bao-Tsan Ko
Inorganic Chemistry Communications, 卷.90, 頁碼.1-7
04/2018
DOI: https://doi.org/10.1016/j.inoche.2018.01.018

摘要

Benzotriazole iminophenolate ligand Catalyst Lactide Ring-opening polymerization Titanium complex ε-caprolactone Physical and Theoretical Chemistry Inorganic Chemistry Materials Chemistry
Titanium catalysts incorporated by imino-benzotriazole phenolate (IBTP) ligands ( C1NN IBTP, C1Fu IBTP and C1NO IBTP) were synthesized and structurally characterized. The reaction of Ti(O i Pr) 4 with C1NN IBTP-H (1.0 molar equiv.) in toluene produced hexa-coordinated mono-adduct titanium complex [( C1NN IBTP)Ti(O i Pr) 3 ] (1). However, six-coordinated bis-adduct Ti complex [( C1Fu IBTP) 2 Ti(O i Pr) 2 ] (2) or [( C1NO IBTP) 2 Ti(O i Pr) 2 ] (3) resulted from treatment of Ti(O i Pr) 4 with C1Fu IBTP-H or C1NO IBTP-H in CH 2 Cl 2 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.

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