title: A Simple ¹³C NMR Method for the Discrimination of Complex Mixtures of Stereoisomers: All Eight Stereoisomers of α-Tocopherol Resolved.
abstract: A simple one-dimensional (13)C NMR method is presented to discriminate between stereoisomers of organic compounds with more than one chiral center. By means of this method it is possible to discriminate between all eight stereoisomers of α-tocopherol. To achieve this the chiral solvating agent (S)-(+)-1-(9-anthryl)-2,2,2-trifluoroethanol and the compound of interest were dissolved in high concentrations in chloroform-d, and the nuclear magnetic resonance (NMR) spectrum was recorded at a low temperature. The individual stereoisomers of α-tocopherol were assigned by spikes of the reference compounds. The method was also applied to six other representative examples.
authors.affiliation: DSM Biotechnology Center, DSM, Delft, Netherlands.
authors.forename: Peter P
authors.initials: PP
authors.lastname: Lankhorst
authors.affiliation: DSM Nutritional Products, Research and Development, Basel, Switzerland.
authors.forename: Thomas
authors.initials: T
authors.lastname: Netscher
authors.affiliation: DSM Biotechnology Center, DSM, Delft, Netherlands.
authors.forename: Alexander L L
authors.initials: AL
authors.lastname: Duchateau
mesh_terms: D066241:Carbon-13 Magnetic Resonance Spectroscopy / Q000379:methods*; D013237:Stereoisomerism; D024502:alpha-Tocopherol / Q000737:chemistry*
chemical_list: D024502:alpha-Tocopherol
keywords: Pirkle's alcohol; TFAE; diastereoisomers; enantiomers; vitamin E