BENZOYL. 861 



Benzhydr amide, a crystalline substance, isomeric with hydro- 

 benzamide. Azobenzo'ile, C 42 H 15 N 2 , or C 14 H 5 N ; a white crys- 

 talline powder, soluble in alcohol. Benzoilic azotide, C 14 H 3 N, 

 a white, insipid, crystalline powder, insoluble in boiling alcohol. 

 These three bodies were derived by Laurent from a yellow 

 resinous mass, which is formed by the action of solution of 

 ammonia, upon the crude essence of bitter almonds of com- 

 merce. 



Hydruret of sulphobenzoyl, C 14 H 5 S 2 + H ; a body represent- 

 ing the hydruret of benzoyl, of which the 2 atoms of oxygen of 

 the benzoyl are replaced by 2 atoms of sulphur. M. Laurent 

 has generally succeeded in preparing this compound by dis- 

 solving 1 volume of the crude essence of bitter almonds in 8 or 

 10 volumes of alcohol, and then adding gradually 1 volume of 

 sulphuret of ammonium. The liquor becomes turbid in a few 

 minutes, and allows a white powder to fall, similar to farina. 

 By throwing this on a filter, and washing it several times with 

 boiling alcohol, the hydruret of sulphobenzoyl is usually ob- 

 tained pure. It is white, pulverulent, and composed of small 

 rounded grains, like those of starch, without a trace of crys- 

 tallization. Although apparently inodorous, it communicates a 

 highly disagreeable odour to the hands. It is insoluble in water 

 and alcohol, slightly soluble in ether. It is slowly decomposed 

 by an alcoholic solution of potash.* 



Hydruret of sulphazobenzoyl, a crystalline compound, formed 

 by dissolving essence of bitter almonds in 4 or 5 volumes of 

 ether, adding to it 1 volume of sulphuret of ammonium, and 

 leaving the whole for fifteen days or a month. It forms a 

 white crystalline crust, which it is necessary to dissolve and 

 crystallize from ether to purify it. Its analysis represents a 

 compound of 6 atoms of hydruret of sulphobenzoyl with L atom 

 of hydrobenzamide : 



6(C u H.S a + H) +C 42 H 18 N 2 . 



Other views may be taken of the constitution of this sub- 

 stance. On the theory upon which it is named by Laurent, it 



* Sur de Nouvelles combinaisons benzoiliques azotdes et sulphure'es ; par M. 

 Laurent. Annales de Chimie, &c. 3me Serie, tome 1, p. 292. 



