Titanium, zirconium and hafnium complexes bearing amino-benzotriazole phenolate ligands as efficient catalysts for ring-opening polymerization of lactides

Abstract Group 4 catalysts incorporated in 2-(2H-benzotriazol-2-yl)-4-methyl-6-(morpholinomethyl)phenolate ligand (C1MOBTP) were synthesized and structurally characterized. The reaction of Ti(OiPr)4 or M(OiPr)4(iPrOH) (M = Zr, Hf) with C1MOBTP-H (2.0 M equiv.) in toluene produced the hexa-coordinated bis-adduct metal complex [(C1MOBTP)2M(OiPr)2] (M = Ti for 1, Zr for 2 and Hf for 3). Experimental results indicate that hafnium complex 3 displayed the higher catalytic activity than those of di-C1MOBTP-featuring complexes 1 and 2 for the controlled L-LA polymerization. Hafnium alkoxide 3 catalyzes the ring-opening polymerization effectively not only in a “controlled” fashion but also an “immortal” manner, giving the corresponding polymers with the expected molecular weights and narrow molecular weight distributions.

• Publication year

  2019

• Venue

  Inorganic Chemistry Communications

• Publication date

  2019-11-01

• Fields of study

  Chemistry

• Identifiers
  DOI 10.1016/j.inoche.2019.107561
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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