Volume 1

A treatise on chemistry / by H.E. Roscoe and C. Schorlemmer.

  • Henry Enfield Roscoe
Date:
1877-1892
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on chemistry / by H.E. Roscoe and C. Schorlemmer. Source: Wellcome Collection.

    698/792 page 682
    NIL C = Nil I nh2. 436 The amido-com pounds which have been described, as well as guanidine, are formed when urea or tliio-urea is heated. The following equations show the decompositions which in these cases take place : the names of only the final products of the reaction are given. The formation of these can be best explained by assuming the existence of intermediate reactions which are here shown, although the formation of these inter- mediate products has as yet not been observed. I. Action of heat upon urea1:— (a) 2CO(NH,)2 = (CO.NH^NH 4 NH3. Biuret. Ammonia. (b) 2CO(NH2)2 = CN.ONH4 + CNOH 4- NH3. (c) CO(NH2)2 = cn.nh2 + h2o. (cl) CN.OH 4 tLO = C02 + Nil,. Carbon dioxide. (e) C02 4- 2NH3 = CO(NH2)ONH4. Ammonium carbamate. (/) 2CNOH + CN.NLL = C3N3(OH)2NH2. Meianuric acid. (g) 3CNOH = C3N3(OII)3. Cyanuric acid. II. Action of heat upon tliio-urea2:— (a) CS(NH2)2 = H2S 4 CN NH, (b) CN.NH2 + CN.SNH4 = C(NH2\NH.CNSH. Guanidine thiocyanate. (c) CN.SNH4 + 2H2S = CS(SNII4)2. Ammonium tliiocarbonate. (d) 3C(NH2)2NH.CNSH = 2C3N3(NH2)3 + 3H2S. (0 2C3N3(NH2)3 = [C3N3(NH2)2]2NH 4- NH3. M elam. 1 Drechsel, Journ. Pr. Chem. [2], ix. 284. 2 Volhard, ibid. 6.
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