The NMR spectra of a number of octadecadiynoic acids and of the derived cis, cis-and trans, trans-octadecadienoates have been studied using a 100 MHz instrument. Characteristic spectral features associated with the number of methylene groups between the two unsaturated centres are described. In diun
Fatty acids, part 15. Nuclear magnetic resonance spectra of the CIS octadecenoic acids and of some acetylenic acids
β Scribed by F.D. Gunstone; I.A. Ismail
- Publisher
- Elsevier Science
- Year
- 1967
- Tongue
- English
- Weight
- 169 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0009-3084
No coin nor oath required. For personal study only.
β¦ Synopsis
The N.M.R. spectra of the cis octadecenoic (A2-A17), octadecynoic (A2-A 5, AlΒ°), and dodecynoic (A s_ A ll) acids have been recorded. Those with unsaturation near the centre of the molecule cannot be distinguished from one another but the four isomers with unsaturation closest to the carboxyl group and the four with unsaturation closest to the methyl group show distinctive spectral features which allow them to be identified. * Part 14, Chem, Phys. Lipids ! (1967) 264.
π SIMILAR VOLUMES
All the cis n-octadecenoic acids (A2-A 17) have been synthesised along with several dodecenoic (AT-All), dodecynoic (A7-All), and octadecynoic (A 2, A4-A 12) acids required as intermediates. ## Discussion \* Part 12, J. Chem. Soe. (1963) 5772. \* Unless otherwise indicated the purity of all este
The 13C-NMR spectra of 48 cis alkenoic acids and esters (C8-C20), 18 trans alkenoic acids and esters (C9-C18), and 26 polyenoic acids and esters (C18-C22) are reported and interpreted. The characteristic features of such spectra which permit structural assignments to be made are discussed.
Acetylenic compounds especially acetylenic fatty acids (Cl, to Cz1) were first of all identified in higher plants. Their structure is very different with regard to the number of the double and triple bonds per molecule, and the functional groups. The mechanism of the biogenesis and the influencing