37 



which boils at 220, and possesses an aromatic odour, similar to that 

 of benzoic ether. The analysis of this substance leads to the 



formula 



C 20 H 10 4 =C 14 [H 6 (C 6 H 5 )]0 4 . 



The same body is easily produced by the mutual reaction of iodide 

 of acryl and benzoate of silver. 



Acetate of acryl, obtained by the action of iodide of acryl upon 

 acetate of silver, is a liquid lighter than water, of an odour resem- 

 bling that of common acetic ether. According to our analysis, it 



contains 



C 10 H 8 4 =C 4 H 3 (C 6 H 5 )0 4 . 



Cyanate of silver is most violently attacked by iodide of acryl, 

 even in the cold. The heat 'generated during this reaction is so 

 powerful that the whole of the new product distils over. The sub- 

 stance thus obtained has an incredibly penetrating odour, and causes 

 lacrymation in the highest degree. The analysis of this colourless 

 transparent liquid, which boils at 82, led to the formula 

 C 8 H 5 N0 2 =C 2 (C 6 H 5 )N0 2 . 



This is the cyanate of acryl. Gently warmed with a solution of 

 ammonia, this liquid readily dissolves, and the solution deposits 

 upon evaporation magnificent crystals, which are nothing but acry- 

 lic urea 



C 8 H 8 N 2 2 = C 2 H 3 (C 6 H 6 )N 2 2 



corresponding to thiosinnamine, the long-known sulphur-urea term of 

 this series, 



C 8 H 8 N 2 S 2 = C 2 (H 3 ,C 6 H 5 )N 2 S 2 . 



Aniline produces with cyanate of acryl an analogous substance, 

 which crystallizes remarkably well. 



When treated with water, cyanate of acryl is gradually converted 

 into a solid crystalline substance. The compound obtained in this 

 manner has the composition and all the properties of sinapoline or 

 diacrylic urea. Its formula is 



CM H 12 N 2 2= C 2 [H 2 (C 6 H 5 ) 2 ]N 2 O 2 , 

 and its formation is illustrated by the following equation : 

 2C 8 H 5 N0 2 + 2HO == C 14 H 12 N 2 O 2 + 2CO 2 . 

 Cyanate of acryl. Sinapoline. 



Cyanate of acryl is decomposed by a concentrated solution of 



