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Nuclear magnetic resonance spectroscopy: Abnormal splitting of ethyl groups due to molecular asymmetry

Shafer, Paul R. and Davis, Donald R. and Vogel, Martin and Nagarajan, K. and Roberts, John D. (1961) Nuclear magnetic resonance spectroscopy: Abnormal splitting of ethyl groups due to molecular asymmetry. Proceedings of the National Academy of Sciences of the United States of America, 47 (1). pp. 49-51. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:SHApnas61

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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.


Item Type:Article
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.
Record Number:CaltechAUTHORS:SHApnas61
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SHApnas61
Alternative URL:http://www.pnas.org/cgi/reprint/47/1/49
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10393
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:02 May 2008
Last Modified:26 Dec 2012 10:00

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