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Synthesis and X-ray structures of new titanium(IV) aryloxides and their exploitation for the ring opening polymerization of epsilon-caprolactone


Reference:

Davidson, M. G., Jones, M. D., Lunn, M. D. and Mahon, M. F., 2006. Synthesis and X-ray structures of new titanium(IV) aryloxides and their exploitation for the ring opening polymerization of epsilon-caprolactone. Inorganic Chemistry, 45 (5), pp. 2282-2287.

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Abstract

A series of titanium catecholates have been prepared and characterized by single-crystal X-ray diffraction studies. Complexes 1a-7a were synthesized by the reaction of 1 equiv of ligand with Ti((OPr)-Pr-i)(4). All are dimers in the solid-state, in which a catechol bridges between two titanium centers. Electronic (nitro and methoxy groups) and steric (tert-butyl groups) effects of the ligand have been investigated. Complex 1b was synthesized by reaction of 2 equiv of ligand with Ti(OiPr)4. A dimer is again observed with the same bridging ligand together with a terminal catechol moiety. All complexes contain a coordinated 2-propanol ligand on each titanium center forming pseudo-octahedral metal centers. All complexes were tested for the ring-opening-polymerization of c-caprolactone to afford polycaprolactone (PCL). Reasonable yields (up to 79%) were obtained at room temperature, and narrow molecular weight distributions (1.13-1.27) were observed for the PCL produced. The most active complex was found to be complex 1a, containing unsubsituted catechol ligands.

Details

Item Type Articles
CreatorsDavidson, M. G., Jones, M. D., Lunn, M. D. and Mahon, M. F.
DOI10.1021/ic051708n
DepartmentsFaculty of Science > Chemistry
RefereedYes
StatusPublished
ID Code4716
Additional InformationID number: ISI:000235787300054

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