The nuclear magnetic resonance spectrum of 2:3-dibromobutyric acid; a negative long-range spin coupling constant
- 1 January 1962
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 5 (1), 85-90
- https://doi.org/10.1080/00268976200100091
Abstract
It is shown that steric repulsions stabilize one of the three rotational isomers of 2 : 3-dibromobutyric acid at the expense of the others. The high resolution proton magnetic resonance spectra may be analysed as ABX3 systems, but preferential solvent shifts cause the observed patterns to change drastically with solvent. The spin coupling between the methyl group and the proton in the gauche configuration, an interaction over four chemical bonds, is found to be -0·35 c/s.Keywords
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