Upon a Fourth Monobromphenol. \\ 



ever, doubt that this product is a simple atomistic combination. 

 J have not, therefore, endeavored to obtain it again. 



The second of the above-mentioned nitro-compounds is free 

 from bromine. It forms when, through a capillary tube, the 

 fourth bromphenol is admitted by drops, into yellow nitric acid 

 of 1.5 sp. gr. After the usual rectification, a substance is ob- 

 tained of the constant melting-point 118°, which crystallizes 

 from alcohol in small yellow needles that color the skin and 

 paper deep yellow. If heated above its melting-point, it explodes 

 violently, so that, during its analysis, the combustion-tube was 

 broken. The analytical numbers (for C, II, and N) showed, 

 however, that it is a very complicated compound, which contains 

 probably 12 atoms of carbon, and does not fit any longer the 

 benzol-derivatives. I have, therefore, desisted from further 

 examination of it. 



Finally, I must mention, that the fourth bromphenol gives, like 

 the three known isomeres, when carefully melted with potassic hy- 

 drate, a mixture of (chiefly) resorcin, with a little pyro-catechin. 

 The raw product indeed shows, with sesqui-chloride of iron, a 

 green coloring ; the greatest part, however, boiled in the neigh- 

 borhood of 270°, and gave the well-known violet coloring (resor- 

 cin-reaction). And although the part that boiled at about 

 270°, after congelation and squeezing, melted between 76° and 

 78° (resorcin melts at 104°), and gave in the analysis proper 

 numbers for a dioxybenzol, I cannot believe as yet, consider- 

 ing the boiling-point (resorcin boils at 271°) and the same be- 

 havior towards perchloride of iron, that I had an isomeric dioxy- 

 benzol in my hands. 



From the foregoing data, the existence of a new (fourth) 

 bromphenol results most clearly — a fact which is wholly incom- 

 patible with the benzol-hypothesis. It must be specially men- 

 tioned that the tendency of this derivative toward the forma- 

 tion of molecular combinations according to fixed proportions is 

 very manifest, as is also the case with the new nitro-benzoic 

 acids*, as well as with the fourth nitrophenol.| 



* Journal f. prakt. Cliem. (2), 17, 219. 

 f The same (2) 24, 5. 



