Stereoisomerism in bridged octahedral dimeric complexes with tetradentate ligands. Diastereospecific formation of syn-Delta Delta-(cis-beta-L)TiO2 (L-Chiral salen type ligands)

Authors
Tararov, VI Larichev, VS Moscalenko, MA Yashkina, LV Khrustalev, VN Antipin, MY Borner, A Belokon, YN
Citation
Vi. Tararov et al., Stereoisomerism in bridged octahedral dimeric complexes with tetradentate ligands. Diastereospecific formation of syn-Delta Delta-(cis-beta-L)TiO2 (L-Chiral salen type ligands), ENANTIOMER, 5(2), 2000, pp. 169-173
Citations number
15
Categorie Soggetti
Chemistry
Journal title
ENANTIOMER
ISSN journal
10242430 → ACNP
Volume
5
Issue
2
Year of publication
2000
Pages
169 - 173
Database
ISI
SICI code
1024-2430(2000)5:2<169:SIBODC>2.0.ZU;2-4
Abstract
The first two examples of the successful application of chiral salen ligand s for diastereoselective syntheses of dinuclear Ti(IV), ((LTi)-Ti-1)(2)O-2 and ((PdI2LTi)-Ti-2)(2)O-2 species with defined chirality and geometry at t he metal centre are presented. The structure of the complexes was establish ed by X-ray structural analysis. Both complexes have similar structural fea tures: (1) chiral salen ligands have cis-beta configuration around Ti centr es, (2) (R,R) chirality of ligands induces Delta helicity of ligand, and (3 ) syn arrangement of ligand donor atoms in relation to the TiO2Ti plane. St ereoselective effects of the dimers are discussed engaging available litera ture data. A model has been proposed to rationalise high syn selectivity in the formation of dimers.