Licence: In copyright
Credit: Chemical examination of Oenanthe crocata / by Frank Tutin. 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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![definite, whilst the greater part of the material was contained in the middle fraction. The fraction boiling below 240°/60 iMm., hoivever, amounted to about 6 Gms., and, on keeping, solidified to a crystalline mass. It was freed from adhering oil by being drained on porous earthenware, when a crystalline ester, melting at 29°, was obtained, which was identified as methyl palmitate. On hydrolysis it yielded palmitic acid (m.p. 63°). The fraction of esters distilling between 240°, and 250°/60 Mm., which did not deposit any solid, was hydrolysed, and the resulting acids dissolved in ethyl acetate. The solution so obtained deposited a further quan- tity of palmitic acid, which was removed by filtration, but no evidence could be obtained of the presence of any other solid acid. The filtrate from the palmitic acid was evaporated, distilled under diminished pressnre, and cooled, when a further quantity of the saturated acid separated and was removed by filtration. The filtrate consisted of liquid, unsaturated adds. An analysis and determination of the iodine value of the latter gave the following results ;— 01109 gave 0 3121 COj and 01140 H-jO. C=76'8; H=]l-4. CisH.'hOj requires C=77'l; H=11‘4 per cent. 0*2052 absorbed 0'38S6 .'odinc. Iodine value = 189'4. CihHsiOs requires iodine value = 181*4. It thus appears that the unsatumted acids consisted chiefly of linolic add. Ether, Chloroform, Ethyl Acetate, and Alcohol Extracts ok the Resin. The ether extract of the resin was a brown, sticky solid, and amounted to 103 Gms. It was dissolved in ether and treated with various alkalis, but this treatment only removed about half of the material. The products obtained on acidi- fying the various extracts were all nearly black, amorphous resins, and nothing crystalline could be isolated from any of them, with the exception of a trace of an almost colourless crystalline substance, melting at 102-103°, whidi was separated from the ammonium carbonate extract. The neutral portion of the extract was a dull green, viscid mass resembling in appearance the corresponding product from the petroleum extract of the resin, and, like the latter, it quickly became dark reddish-brown in colour when heated with alcoholic potash. Nothing crystalline could be separated from it, and](https://iiif.wellcomecollection.org/image/b22433120_0012.jp2/full/800%2C/0/default.jpg)
