Dr. Hofmann on Phosphoretted Ureas. 363 



The hydrochlorate yields also a precipitate with trichloride of gold ; 

 the salt is, however, rapidly blackened. 



The hydrobromate, both in preparation and properties, resembles 

 the hydrochlorate. Its composition is 



C,eH,„NPS„HBr. 

 The urea readily combines with iodide of methyle and ethyle. The 

 methyle-compound immediately separates in the crystalline form on 

 mixing an ethereal solution of the urea with iodide of methyle ; it is 

 soluble in water, and crystallizes from a boiling solution in beautiful 

 golden-yellow needles, containing 



a„H,„NPS„C,H3l. 

 The iodide, by the action of chloride of silver, may be converted 

 into the chloride ; this yields with dichloride of platinum a fine 

 needle-formed salt, which may be recrystalhzed without decomposi- 

 tion. The formula of this platinum-salt is 



C,, H,„ N PS„ C, n3 CI, Ft, CI,. 

 When treated with oxide of silver, the iodide furnishes a powerfully 

 alkaline liquid, probably the corresponding base 



[(C, H3) ((C; S,)" (C, H,)3 (C,, H,) NP)] I Q^ 



Scarcely separated, however, this substance decomposes with libera- 

 tion of sulphocyanide of phenyle, the oxide of methyl-triethylphos- 

 phonium remaining in solution. This salt is sufficiently characterized 

 by the readily crystallizable octahedral platinum-salt. 



I have not been able to obtain either the sulphate or the nitrate of 

 the urea, probably on account of the great instability of the new 

 substance. 



On dissolving the base, even in dilute nitric acid, it is immediately 

 decomposed with separation of sulphocyanide of phenyle, the triethyl- 

 phosphine being oxidized. Tl e same change is observed when one 

 of the more stable salts, such as the hydrochlorate, is dissolved in 

 a large quantity of water ; the liquid soon becomes turbid from the 

 elimination of oily globules of sulphocyanide of phenyle, and now con- 

 tains the hydrochlorate of the phosphorus-base. 



On adding ammonia to a salt of the urea, similar phenomena are 

 obsen'ed. From a concentrated solution, the base is separated with- 

 out change ; but when dilute and hot solutions are employed, the 

 turbidity at first produced disappears, and after a few minutes beau- 

 tiful crystals of phenyl-sulphocarbamide (Cj^ H^ N^ S^,) * make their 

 appearance ; at the same time the odour of triethylphosphine be- 

 comes perceptible. 



With potassa the deportment is perfectly anrdogous, but the cry- 

 stals formed after some time are diphenyl-sulphocarbamide (sidpho- 

 carbanilide, C^,, 11,^ N.^ SJ instead of j)hcnyl-sulpliocarbamide. 



On adding to an ethereal solution of the urea a few drops of bisul- 



j)hide of carbon, the liquid, when gently heated, assumes a deep 



crimson colour, and deposits, on cooling, the beautiful compound 



(C^ II,)3 P, C, S,, which I have described some time agof . The 



* Proceedings of the Royal Society, vol. ix. p. 276. f Ibid. p. 290. 



2B2 



