ON ISOMERIC NAPHTHALENE DERIVATIVES. 



179 



o 



O — 



Br 



Br 



OH 



O 



OH 



O 



When its solution in ethylic acetate is exposed to light and air for 

 several days another remarkable change occurs, the quinone being trans- 

 formed into a brick-red crystalline substance, insoluble in all solvents, 

 which has the composition, Co„H7Br304 (C = 43-55, H = 1 -28, Br = 43-54, 

 = 11-61 ; /owk/, C = 43-83, H = 1-74, Br = 43-07, = 11-36 per 

 cent.). 



Taking into account the fact that the bromine atom in position 3 of 

 the quinone is very easily removed from the nucleus, as in the produc- 

 tion of 







Br 



OH 



— isodynamic form of 



NPh 

 O 



Br 



NHPh 



— by the action of aniline ; and also the reactivity of the hydrogen in posi- 

 tion 4 (oxidation by atmospheric oxygen), it may be supposed that the 

 condensation product is a di-naphthyl di-quinone. 



The behaviour of 3 : 6-di-bromo-/3-naphtha quinone under the influence 

 of light and various solvents, and under the action of alkalis, is bein^ 

 investigated, 



N2 



