Journal
INORGANICA CHIMICA ACTA
Volume 357, Issue 5, Pages 1337-1344Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2003.10.030
Keywords
Schiff-base complex; oxovanadi; additivity rule; peroxo complex; oxidation catalysis of sulfide
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alpha-Amino acid Schiff-base complexes of oxovanadium(IV), whose ligands have amino acid side chains with coordinating functional groups, retained coordination geometries in which the amino acid side chains were probably coordinated in the axial position with a phenolate oxygen, a carboxylate oxygen, an imine nitrogen, and a solvent being bound in the equatorial plane. As for amino acid ester Schiff-base complexes, the amino acid side chains were coordinated in the equatorial plane in the place of the carboxyl group in the case of the amino acid Schiff-base complexes. The amino acid Schiff-base complexes of oxovanadium(V) were present as dimers in dichloromethane. Peroxo complexes prepared from the Schiff-base complexes of oxovanadium(V) converted methyl phenyl sulfide to the corresponding sulfoxide in 80-90% yield in CDCl3 and in 30-70% yield in CD3OD in 30 min. They converted the sulfide in a stereoselective manner yielding the sulfoxide in small enantiomeric excess (5-20%). (C) 2003 Elsevier B.V. All rights reserved.
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