Charles M. Scrimgeour

Fatty acids. Part 50. 13C nuclear magnetic resonance studies of olefinic fatty acids and esters.

Abstract The 13 C-NMR spectra of 48 cis alkenoic acids and esters (C 8 –C 20 ), 18 trans alkenoic acids and esters (C 9 –C 18 ), and 26 polyenoic acids and esters (C 18 –C 22 ) are reported and interpreted. The characteristic features of such spectra which permit structural assignments to be made are discussed.

Fatty acids. Part 48. 13C nuclear magnetic resonance studies of acetylenic fatty acids

The 13C NMR spectra of thirty-seven alkynoic acids (C8-C18) and ten alkadiynoic acids (C18 and C20) are reported and interpreted. The influence of COOH, COOCH3, CH3, and C identical to C groups on the chemical shifts of nearby carbon atoms is assessed. These influences are largely additive so that available spectra are readily interpreted and the spectra of new compounds of this type can be predicted. These preliminary results indicate that 13C NMR spectroscopy should be of considerable value in the structural identification of acetylenic compounds.

Fatty acids of the seed oils of alpineCruciferae and other alpine species

A fewCruciferae seed oils do not contain erucic acid but are instead rich in linolenic acid. These oils are characteristic of alpine species, and the fatty acid composition of such oils may be an adaption to an alpine habitat.

The purification of fatty acid methyl esters by high pressure liquid chromatography

Procedures are described for the rapid purification of gram quantities of methyl oleate, methyl linoleate, methyl α- and γ-linolenates and methyl ricinoleate from appropriate natural oils by high pressure liquid chromatography (HPLC).

E.s.r. observation of pentadienyl and allyl radicals on hydrogen abstraction from unsaturated lipids

Hydrogen abstraction from linoleate and oleate gives rise to pentadienyl-and allyl-type radicals, respectively, Which have been observed by e. s. r. spectroscopy; delocalised radicals have also been observed from other lipid derivatives including triacylglycerols.

Fatty acids, part 51. The long-chain oxo acids (argemonic acid) in Argemone mexicana seed oil

Abstract The crystalline material which separates from Argemone mexicana seed oil is a mixture of 9-and 11-oxo-octacosanoic and 11-oxotriacontanoic acids.

Fatty acids, Part 44 The preparation of some long-chain hydroperoxides and t-butyl peroxides☆

Abstract A number of long-chain hydroperoxides and t-butyl peroxides have been prepared — some of them for the first time — by the application of known procedures.

Photosensitised oxidation of 12,13-epoxy-, 12-hydroxy-, 12-oxo- and 12-bromo-oleate

Abstract The photosensitised oxidation of four substituted methyl oleates (12,13-epoxy, 12-hydroxy, 12-oxo, and 12-bromo) has been studied. The expected hydroperoxides were isolated by chromatography and indentified by spectroscopic procedure.

New procedure for converting unsaturated fatty acids to their nor-alcohols required as intermediates for the preparation of carboxy-labelled acids

Oleic and linoleic acid have been decarboxylated to the corresponding C17 alcohols which can be oxidised to unsataurated C17 acids or reconverted into the 14C-carboxy-labelled C18 acids.