The selective syntheses of titanium complexes containing 2-(2H-benzo[d][1,2,3]triazol-2-yl)-4,6-di-tert-pentylphenol (LH) ligand such as LTiCl3 (1), LTiCl3(THF) (2), L2Ti(NMe2)2 (3), L2TiCl2 (4), and L2Ti(O-i-Pr)2 (5) were unprecedentedly achieved by changing the solvents or metal precursors. Their solid structures of 1 � 5 were revealed by single-crystal X-ray analyses. Complexes 2, 3, and 5 showed the fast thermal exchange process of benzotriazole ligand L. Among 1 � 5, complex 5 was proven as a highly effective catalyst for the controlled ring opening polymerization (ROP) of lactide (LA) as shown by the linearity of molecular weight versus [LA]/[Ti] ratio as well as very narrow PDI values of PLA polymers obtained.

Titanium complexes containing bidentate benzotriazole ligands for ring opening polymerization of lactide

245th National Meeting (2013)

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