title: Optical resolution and racemization mechanism of a tellurinic acid.
abstract: [reaction: see text] Optically active tellurinic acid was obtained for the first time by chromatographic resolution of racemic 2,4,6-triisopropylbenzenetellurinic acid (1) using a chiral column. Optically active tellurinic acid (+)-1 was stable toward racemization in hexane, although racemization occurred in hexane/2-propanol. The kinetic studies for the racemization, oxygen exchange reaction using H(2)(18)O, and theoretical studies clarified that the racemization of the optically active tellurinic acid in solution proceeds via a hypervalent tellurane formed by addition of water remaining in solvent.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nakashima
authors.forename: Toshio
authors.initials: T
authors.lastname: Shimizu
authors.forename: Kazunori
authors.initials: K
authors.lastname: Hirabayashi
authors.forename: Nobumasa
authors.initials: N
authors.lastname: Kamigata
mesh_terms: D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000032:analysis / Q000138:chemical synthesis*; D010084:Oxidation-Reduction; D013237:Stereoisomerism; D013691:Tellurium / Q000737:chemistry*
chemical_list: C495938:2,4,6-triisopropylbenzenetellurinic acid; D009942:Organometallic Compounds; D013691:Tellurium