OF AROMATIC COMPOUNDS. 53 



tion gave an acid with the formula C M H, O 8 which 

 likewise is decomposed on boiling with dilute acids: 



C 29 H 30 8 = C 17 H 10 6 + C la H 10 0,. 



The compound C 1Q H 10 O 8 is soluble in alcohol, melts 

 at 75, and is isomeric with the hydroquinone ether, 

 obtained by Etard from chlorchromic acid and phenol. 

 It has the composition 



Christomanos 1 observed that while sodium acts 

 only very slowly on dissolved monobrom-benzene, 

 diphenyl can speedily be obtained by placing sodium 

 in the solution and connecting this metal with the 

 positive pole of a battery of two Bunsen elements, 

 whose electrodes are immersed in the solution; di- 

 phenyl is likewise obtained by using zinc instead of 

 sodium. 



Phenyl-mercaptan. Bunge a investigated phenyl- 

 mercaptan in the same manner as the corresponding 

 alkyl compound. Phenyl-disulphide, (C.H B ) a S a , was 

 formed at the positive pole. 



1 Gazz. Chim., 1875, p. 402. 

 1 Chem. Ber., 3, 911. 



