NMR Spectroscopy of Stereoisomers

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. NMR spectroscopy techniques can determine the absolute configuration of stereoisomers such as cis or trans alkenes, R or S enantiomers, and R,R or R,S diastereomers. In a mixture of enantiomers, these methods can help quantify the optical purity by integrating the area under the NMR peak corresponding to each stereoisomer. Accuracy of integration can be improved by inserting a chiral derivatizing agent with a nucleus other than hydrogen or carbon, then reading the heteronuclear NMR spectrum: for example fluorine-19 NMR or phosphorus-31 NMR. Mosher''s acid contains a -CF3 group, so if the adduct has no other fluorine atoms, the 19F NMR of a racemic mixture shows just two peaks, one for each stereoisomer. As with NMR spectroscopy in general, good resolution requires a high signal-to-noise ratio, clear separation between peaks for each stereoisomer, and narrow line width for each peak.

Weitere Informationen

  • Allgemeine Informationen
    • GTIN 09786131023965
    • Editor Lambert M. Surhone, Miriam T. Timpledon, Susan F. Marseken
    • Genre Allgemeines & Lexika
    • Größe H5mm x B220mm x T150mm
    • EAN 9786131023965
    • Format Fachbuch
    • Titel NMR Spectroscopy of Stereoisomers
    • Gewicht 134g
    • Herausgeber Betascript Publishing
    • Anzahl Seiten 88

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