Published January 1, 1961
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Nuclear magnetic resonance spectroscopy: Abnormal splitting of ethyl groups due to molecular asymmetry
Abstract
Nuclear magnetic resonance (n.m.r.) spectroscopy provides an excellent means for qualitative identification of ethyl groups by use of the familiar three-four pattern of spin-spin splitting (1). It has been observed previously (2) that the methylene protons of systems of the type R-CH2-CR1R2R3 (where R1 can be the same as R or different) may be magnetically nonequivalent and display AB rather than A2-type spectra (3). We now wish to report several examples of this type of behavior with ethyl groups, particularly ethoxy groups, knowledge of which could be important to anyone using n.m.r. for organic qualitative analysis.
Additional Information
© 1961 by the National Academy of Sciences. Communicated November 10, 1960. We are much indebted to Dr. Stanley L. Manatt and the Computing Center of the Jet Propulsion Laboratory for IBM 704 calculations of comparison spectra to check the chemical shift and spin-coupling parameters. Supported in part by the Office of Naval Research. Gates and Crellin Laboratories of Chemistry, Contribution No. 2640.Files
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