Summary
The13C spectra of the methyl esters of the cis and trans isomers of 9,10-dibromostearic, of cis,cis-9,10,12,13-tetrabromostearic, and of 10,11-dibromoundecanoic acid have been obtained, and the assignment of all the signals has been performed. It has been shown that the presence of bromine atoms in the chain of a fatty acid leads to the magnetic non-equivalence of the13C nuclei of the methylene groups present at a distance of three carbon-carbon bonds from the nucleus to which the halogen is directly attached. A dependence has been found of the shift parameter of the carbon nuclei in a fatty acid chain on the relative arrangement of the bromine atoms.
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Additional information
V. I. Lenin Tashkent State University. Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 26–30, January–February, 1977.
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Tyshchenko, A.A., Gusakova, S.D. & Stepanichenko, N.N. 13C NMR spectra of bromine derivatives of fatty acids. Chem Nat Compd 13, 22–25 (1977). https://doi.org/10.1007/BF00566163
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DOI: https://doi.org/10.1007/BF00566163