| Abstract
| - The selective synthesis of tri- and dichlorotitanium speciescontaining chiral tridentate Schiff base ligands, derived from(1R,2S)-(−)-1-aminoindanol, was achieved by changing the solvent.Single-crystal X-ray analyses reveal that chlorotitanium complexesare monomeric and octahedral with the meridional occupation ofthe Schiff base. Although the chlorotitanium complexes lack typicalinitiating groups such as alkoxides or amides, they are effectivecatalysts for the controlled ring-opening polymerization of l-lactide(l-LA) as shown by the linearity of the molecular weight vs [l-LA]/[Ti] ratio plot as well as very narrow polydispersity index values.
- Novel octahedral di- and trichlorotitanium complexes having chiral Schiff base ligands were prepared. The formation of the complexes is dependent on the solvent: The use of tetrahydrofuran and Et2O afforded di- and trichloro species, respectively. They proved to be useful catalysts for the controlled ring-opening polymerization of lactide even though typical initiating groups such as alkoxides or amides are lacking.
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