Studies on the preparation and analysis of glyceryl ether derivatives and the isolation and reductive ozonolysis of unsaturated glyceryl ethers

Glyceryl ethers were identified and quantified by the GLC analysis of their alkyl iodide (special conditions described), acetonide and allyl alkyl ether derivatives. The acetoxy-mercuri-methoxy derivatives of unsaturated glyceryl ether swere separated from saturated glyceryl ethers by TLC and the fractions were analyzed as alkyl iodides. Monoiodides from saturated glyceryl ethers and diiodides from unsaturated glyceryl ethers were also separated by TLC and then analyzed. Allyl alkyl ethers had small retention volumes and these derivatives were separated into pure fractions by preparative GLC. Ozonides were reduced either to alcohols with lithium aluminum hydrodie or to aldehydes with dimethyl sulfide. The alcohols were converted to mono- and diiodides which were separated by TLC and analyzed by GLC. The recovery of n-C(6) and n-C(7) monoiodides was not quantitative. Diiodides and aldehydes were both identified and quantified by GLC. Ozonolysis data suggest that the 16ratio1 glyceryl ethers from dogfish liver oil contain 7,8 and 9,10 isomers and the 18ratio1 glyceryl ethers contain 9,10 and 11,12 isomers.

New method for the reductive ozonolysis of double bonds in monoenoic fatty acid methyl esters

Unsaturated methyl esters were cleaved to aldehydes and aldehydo-esters by ozonolysis followed by reduction with dimethyl sulfide after conversion to hydroperoxides. Cleavage products were identified by thin-layer chromatography and quantified by temperature programmed gas-liquid chromatography.

Synthesis of fatty aldehydes and their cyclic acetals (new derivatives for the analysis of plasmalogens)

Saturated and unsaturated fatty aldehydes were prepared in good yield by the reduction of acid chlorides with lithium aluminum tri-t-butoxy hydride. Saturated odd and even numbered aldehydes were prepared by the ozonolysis-reduction of 1-alkenes. Ozonides were hydrogenated with a Lindlar catalyst or reduced with dimethyl sulfide. Several diols, including 1,3-propanediol and ethylene glycol, were used to synthesize cyclic acetals from aldehydes and plasmalogens in quantitative yield. Cyclic acetals were synthesized from 2,4-dinitrophenyl hydrazones when an exchanger such as acetone or acetylacetone was included in the reaction mixture. A number of physical and chemical properties indicate that cyclic acetals are stable compounds which do not decompose during storage or gas-liquid chromatographic (GLC) analysis. The cyclic acetals have unusually long retention volumes which are probably related to the large dipole moments found with cyclic compounds. These derivatives are, therefore, readily separated from their aldehyde and methyl ester analogues on polar and nonpolar stationary phases. GLC analysis of the aldehydogenic moieties in plasmologens may be conveniently carried out by direct conversion to cyclic acetals without preliminary isolation of aldehydes or removal of methyl esters by saponification.