The constitution of chaulmoogric and hydnocarpic acids / by Marmaduke Barrowcliff and Frederick B. Power.
- Barrowcliff, Marmaduke.
- Date:
- 1907
Licence: In copyright
Credit: The constitution of chaulmoogric and hydnocarpic acids / by Marmaduke Barrowcliff and Frederick B. Power. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![s LYIL—The Constitution of Chaulmoogric and Tlydno cavpic Acids. \ By Marmaduke Barrowcliff and Frederick Belding Power. In a previous communication on “ The Constituents of Chaulmoogra Seeds” (Power and Gornall, Trans., 1904, 85, 838) the isolation of a new, unsaturated, optically active acid was described. This acid, designated chaulmoogric acid, melted at 68°, had [a]o +56°, and was shown to possess the formula CjgHggOg. Although isomeric with linolic acid, it combined with only two atomic proportions of bromine or iodine, and must, therefore, contain in its structure both a closed ring and an ethylenic linking. In a subsequent communication, entitled “ The Constitution of Chaul- moogric Acid, Part I” (Trans., 1904, 85, 851), several derivatives of this new acid were described. It was also shown that, for an unsatu- rated compound, it exhibited certain remarkable properties, since it was unattacked by fused alkalis, even at 300°, and when boiled with sodium and amyl alcohol the ethylenic linking was not reduced. When oxidised in alkaline solution with potassium permanganate, dihydroxydihydrochaulmoogric acid, CjgH3202(0H)2, was obtained, together with formic acid, and an acid possessing the formula C,gH2g0(C02H)2.* The authors have extended the study of chaulmoogric acid, more especi- ally with regard to the products furnished by its oxidation with potassium permanganate. The present communication embodies the results obtained, and the conclusions which may bo drawn from them respecting the constitution of this acid. * An ester, to which the formula CigHaaiCOjEtla was xjreviously ascribed, has now been found to have consisted of impure etliyl dodecanedicarboxylate. No acid of the formula CijHjaiCOjHla is produced by the oxidation of chaulmoogric acid.](https://iiif.wellcomecollection.org/image/b2242507x_0005.jp2/full/800%2C/0/default.jpg)
