Synthesis of di-, tri- and penta-nuclear titanium(IV) species from reactions of titanium(IV) alkoxides with 2,2'-biphenol (H(2)L(1)) and 1,1'-binaphthol (H(2)L(2)); crystal structures of [Ti(3)(mu(2)-OPr(i))(2)(OPr(i))(8)L(1)], [Ti(3)(OPr(i))(6)L(1)(3)], [Ti(5)mu(3)-O)(2)(mu(2)-OR)(2)(OR)(6)L(1)(4)](R = OPr(i), OBu(n)) and [Ti(2)(OPr(i))(4)L(2)(2)]

Jonathan P Corden; William Errington; Peter Moore; Martin G Partridge; Malcolm G H Wallbridge

doi:10.1039/b404197f

Synthesis of di-, tri- and penta-nuclear titanium(IV) species from reactions of titanium(IV) alkoxides with 2,2'-biphenol (H(2)L(1)) and 1,1'-binaphthol (H(2)L(2)); crystal structures of [Ti(3)(mu(2)-OPr(i))(2)(OPr(i))(8)L(1)], [Ti(3)(OPr(i))(6)L(1)(3)], [Ti(5)mu(3)-O)(2)(mu(2)-OR)(2)(OR)(6)L(1)(4)](R = OPr(i), OBu(n)) and [Ti(2)(OPr(i))(4)L(2)(2)]

Dalton Trans. 2004 Jun 21:(12):1846-51. doi: 10.1039/b404197f. Epub 2004 May 25.

Authors

Jonathan P Corden¹, William Errington, Peter Moore, Martin G Partridge, Malcolm G H Wallbridge

Affiliation

¹ Department of Chemistry, University of Warwick, Coventry, UK CV4 7AL.

PMID: 15381990
DOI: 10.1039/b404197f

Abstract

Reaction of titanium(iv) alkoxides [Ti(OR)(4)](R = OPr(i), OBu(n)) with 2,2[prime or minute]-biphenol [C(12)H(8)(OH)(2), H(2)L(1)] affords two trinuclear species [Ti(3)(OPr(i))(10)L(1)] and [Ti(3)(OPr(i))(6)L(1)(3)] each possessing an open-chain V-shaped arrangement of three titanium atoms with the former having both bridging alkoxide and biphenylate groups and the latter having only biphenylate as bridging groups. Variations in reaction conditions yield the pentanuclear species [Ti(5)([micro sign](3)-O)(2)(OR)(8)L(1)(4)](R = OPr(i), OBu(n)) which have two central bridging oxygen atoms in the Ti(5) framework and bridging alkoxide and biphenylate groups. In contrast 1,1[prime or minute]-binaphthol [C(24)H(12)(OH)(2), H(2)L(2)] yields the dinuclear [Ti(2)(OPr(i))(4)L(2)(2)] where only the binaphthylate ligands act as bridging groups. Some of the compounds show catalytic activity in esterification reactions.