Polymerization of ε-caprolactone using bulky alkoxo-titanium complexes and structural analysis of [Ti(OBorneoxo)2Cl2(thf)2]

A variety of bisalkoxo titanium dichloride THF adducts [Ti(OR)2Cl2(thf)2] have been prepared. The molecular structure of hexacoordinated titanium dichloride with alkoxo units derived from borneol has been determined by single-crystal X-ray diffraction studies. The parent Lewis acid bisalkoxo titanium dichloride derivatives [Ti(OR)2Cl2] and related alkoxo complexes [Ti(OR)2(OPri)2]2 have been tested as initiators in ring-opening polymerization of ε-caprolactone and l-lactide.