Copy 1, Volume 12

Hand-book of chemistry / Translated by Henry Watts.

  • Gmelin, Leopold, 1788-1853
Date:
1848-1872
Catalogue details

Licence: Public Domain Mark

Credit: Hand-book of chemistry / Translated by Henry Watts. Source: Wellcome Collection.

    561/594 (page 531)
    Page 187. Iodide of Acetyl, ©*H*0O*,I. A. Canours. Compt. rend. 44, 1252; Ann. Pharm. 104, 109. F. Guturiz. Ann. Pharm. 108, 335. Iodide of Othyl. formation By the action of iodide of phosphorus on anhydrous acetic acid (Guthrie), or anhydrous acetate of potash. (Cahours.) Preparation. 1. Anhydrous acetic acid (1 At.) is poured upon more than 1 At. of dry phosphorus in a long-necked flask, and rather more than 1 At. dry iodine gradually added by small portions. The flask is then heated till the action is complete, and the liquid still containing free iodine, is poured into a retort containing a few pieces of dry phos- phorus, and having its neck turned upwards and connected with a con- densing apparatus. After the liquid bas been boiled in this manner for some minutes, the neck of the retort is turned downwards and the liquid distilled off. The boiling point remains almost constant at 108°, but towards the end, when there is but little liquid remaining, it rises to 120°. The distillate is well shaken with mercury till it becomes trans- parent, then quickly poured off and rectified, the portion which distils at 108° being collected apart. However carefully the distillation may be conducted, part of the iodide of acetyl is decomposed, hydriodic acid escaping, and a solid substance containing iodine, probably a substitution-product, remaining. 39 oz. of anhydrous acetic acid treated as above with 93 oz. of iodine and about 1 0z. of phosphorus, yielded about 5 oz. of iodide of acetyl. (Guthrie.) Properties. Transparent colourless liquid. (Cahours.) When first pre- pared it has a brownish colour, which, according to Guthrie, is peculiar to it, and cannot be removed by agitation with mercury; Cahours however states that the colour is completely removed by agitation with mercury. Sp. gr. 1°98 at ae (Guthrie.) Boils at 108° (Guthrie); between 104° and 105°. (Cahours.) It fumes strongly in the air, has a very pungent odour, and intensely sour caustic taste. (Guthrie.) Guthrie. 4C 24 E412) nts 15°39 SH PA. wah down 3 L37-Gyy sci: 2°33 RAMUS Re claiess ey FHLMC AN = sok Wag 73°68 P44 DAES lee: 16 Ori gt. ee. 8°60 CAH OPT ........ AAD: 2 copes AOA = etosaanc 100°00 The excess of carbon and hydrogen in the analysis arose from admixture of anhydrous acetic acid. Decompositions. 1. Iodide of acetyl is partially decomposed by distil- lation (vid. sup), —2. Water decomposes it instantly and with violence, forming hydriodic and acetic acids. (Guthrie, Cahours.) —3. It acts violently on alcohol, forming acetate of ethyl. (Cahours.) — 4. It is decomposed by zinc aad by sodium at ordinary temperatures, also by 2M 2