Sentence Examples


  • Carbon bisulphide combines with primary amines to form alkyl dithiocarbamates, which when heated lose sulphuretted hydrogen and leave a residue of a dialkyl thio-urea, CS 2 +2R NH 2 - R NH CSS NH 3 RCS(NHR)2+H2S; or if the aqueous solution of the dithiocarbamate be boiled with mercuric chloride or silver nitrate solution, a mustard oil (q.v.) is formed, R.NH CSS NH3R+HgC12-Hg(R NH CSS)2->2RNCS-}-HgS+H2S.
  • The aqueous solution of the amines is now shaken up with diethyl oxalate, when the primary amine forms a crystalline dialkyl oxamide and the secondary amine an insoluble liquid, which is an ethyl dialkyl oxamate, the tertiary amine not reacting: (C02C2H5)2+ 2NH 2 R = (CO�NHR) 2 -{- 2C 2 H S OH; (CO 2 C 2 H 5) 2 -}- NHR 2 = C 2 H S O 2 C�Conr 2 -1-C 2 H S Oh.
  • On treatment with zinc and alkyl iodides or with zinc alkyls they are converted into esters of hydroxy-dialkyl acetic acids.
  • The monoalkyl derivatives are desulphurized by lead hydroxide in the presence of sodium carbonate, the aß dialkyl and trialkyl derivatives being unaffected (A.
  • The dialkyl thioureas when digested with mercuric oxide and amines give guanidines.
 

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