Benzoyl Compounds, 449 



On the Compounds of Cyanogen with Sulphuretted Hydrogen. 



Volckel has made some experiments, under Wohler, on the 

 two compounds obtained by mixing together cyanogen and 

 sulphuretted hydrogen. The yellow compound has been de- 

 scribed by Gay-Lussac, the red one by Wohler. By passing 

 the two gases at the same time into alcohol, but so that the 

 cyanogen is always in excess, the yellow body is obtained; 

 when sulphuretted hydrogen is in excess the red one is form- 

 ed. They may be purified by recrystallization out of alcohol. 

 The red body has the formula C 2 N 2 H 4 S 2 . By adding ace- 

 tate of lead to an excess of this body dissolved in alcohol, a 

 yellow precipitate is obtained ; its formula, when dried in 

 vacuo, is C 2 N 2 H 2 S 2 Pb. In the red body, therefore, one 

 equivalent of hydrogen has been replaced by one equivalent 

 of lead. It may be considered as similar to mercaptan, viz. 

 C 2 N 2 H 2 S + H 2 S. The lead compound is C 2 H 2 N 2 S 

 -f Pb S. By boiling with water this salt is decomposed, sul- 

 phuret of lead is formed, cyanogen is evolved, and the solu- 

 tion contains both the red and the yellow body. The red 

 body is soluble in a cold solution of potassa, it is precipitated 

 again by acids. Boiled with a concentrated solution of po- 

 tassa, it forms sulphocyanuret, sulphuret, and cyanuret of 

 potassium. Boiled with a dilute solution it forms ammonia, 

 oxalate of potassa, and sulphuret of potassium. It may be 

 considered as oxamid, in which the oxygen is replaced by 

 sulphur. The yellow compound decomposes very easily, 

 does not give any lead compound ; with a salt of silver it is 

 decomposed like the red compound; cyanogen is evolved, 

 and sulphuret of silver precipitated. According to Gay-Lus- 

 sac, its composition is C 4 N 4 H 6 S 3 , or perhaps 2 C 2 N 2 H 2 S 

 + H 2 S. If we double its formula we have the composition 

 of allantoin, in which the oxygen is replaced by sulphur. {An- 

 nalen der Chemie und Pharmacie, xxxviii. p. 314.) 



On some Benzoyl Compounds. 



Laurent has examined the action of sulphuretted hydrogen 

 and of hydrosulphuret of ammonium on the benzoyl com- 

 pounds. 



Hydruret of sulphobenzoyl is obtained by dissolving one 

 volume of oil of bitter almonds in eight or ten volumes of 

 alcohol, and adding slowly one volume of the hydrosulphu- 

 ret; after a few minutes a white mealy powder is deposited. 

 By adding a little hydrosulphuret to the boiling hot alco- 

 holic solution of the oil, a white voluminous precipitate of the 

 hydruret is produced. It is insoluble in water and alcohol, 



Phil. Mag. S. 3. Vol. 19. No. 126. Dec. 1841. 2 G 



