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- W2088854546 abstract "A series of titanium complexes having tellurium-bridged chelating bis(aryloxo) ligands, [TiX2{2,2‘-Te(4-Me-6-tBu-C6H2O)2}]2 (5: X = Cl; 6: X = OiPr), catalyzed the ring-opening polymerization of cyclic esters such as ε-caprolactone, δ-valerolactone, and l-lactide. The strong dependence of polymerizations on the solvent was observed in this catalytic system. When the polymerizations of ε-caprolactone and l-lactide were carried out in toluene at 100 °C, tellurium-bridged bis(aryloxo)titanium complex 5 was found to give polymers with rather broad molecular weight distribution due to back-biting. When the polymerizations of ε-caprolactone and l-lactide was carried out in anisole or in dioxane at 100 °C, complex 5 was found to initiate the controlled polymerization, to result in quantitative polymer yields and narrow molecular weight distributions (living nature). The diblock copolymers of l-lactide and ε-caprolactone were also obtained with the catalyst system 5 in anisole. The diblock copolymers showed two melting endothermic at 44.7−53.5 °C derived from the ploy(ε-caprolactone) block and at 155.2−156.8 °C derived from the ploy(l-lactide) block." @default.
- W2088854546 created "2016-06-24" @default.
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- W2088854546 date "2002-08-23" @default.
- W2088854546 modified "2023-10-14" @default.
- W2088854546 title "Polymerizations of Cyclic Esters Catalyzed by Titanium Complexes Having Chalcogen-Bridged Chelating Diaryloxo Ligands" @default.
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- W2088854546 doi "https://doi.org/10.1021/ma0204711" @default.
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