Browsing by Author "Rogers, Donald W."

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Heats of hydrogenation of large molecules. Part 3.—Five simple unsaturated triglycerides (triacylglycerols)
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (09-12), 1978) Rogers, Donald W.; Choudhury, Debendra N.
    We have determined the enthalpies of hydrogenation of the simple triglycerides of oleic, elaidic, petroselinic, linoleic and linolenic acids. These compounds include the largest molecules ever studied by hydrogen calorimetry and one of them (trilinolenin) produces the largest heat of hydrogenation yet observed. Heats of hydrogenation per double bond for the five triglycerides reported here are remarkably consistent with each other and with those of the free fatty acids and methyl esters previously studied. These results suggest a molecular conformation in hexane solution in which the unsaturated acid residues are well separated and the double bonds are thermochemically independent.
  • No Thumbnail Available
    Item
    Heats of Hydrogenation of Large Molecules: Part 2.—Six Unsaturated and Polyunsaturated Fatty Acids
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (01), 1978) Rogers, Donald W.; Hoyte, Otho P. A.; Ho, Rickey Kam C.
    We have determined the heats of hydrogenation of the Cj6 and Cib unsaturated and poly unsaturated fatty acids, palmitoleic, oleic, elaidic, linoleic, linelaidic and linolenic acids. This paper reports and interprets the results in the light of previous experimental measurements and theoretical predictions. Heats of formation follow from Hess’ Law addition to the reliable values of the heats of formation of the hydrogenation products, hexadecanoic (palmitic) and octadecanoic (stearic) acids. Our results are generally in serious disagreement with the scattered experimental data and predictions gleaned from the literature and represent, we think, a significant improvement over them.