Ce ae ee ee ee 
P. T. Austen—Dinit librombenzol: 51 
ft a 
Ammonium Beta-dinitroparabromphenylate. 
Preparation.—By action of ammonia on an alcoholic solution 
of the phenol. 
Analysis.— 
C,H,(NO,),BrONH,=C,H,N,O,Br 
0°52 grams of substance gave 0°4 grams of PtCl,, 2AmC1. 
Calculated. Found. 
NH,=6'52 6-20 
Properties,—Bright red silky needles. Soluble in boiling water 
and alcohol. When heated in a mattrass to 140°, it is volatile, 
forming a red sublimate which can be driven about by cautious 
heating. On higher heating it is dissociated into ammonia and 
phenol. A partial recombination takes place on cooling. 
Copper Beta-dinitroparabromphenylate. 
Preparation.—It was obtained by action of a slight excess of 
well-washed CuCO, on the phenol in boiling dilute alcoholic 
solution. The resulting mass was dissolved in glacial acetic 
acid. The salt was thereby decomposed, cupric acetate an 
phenol being formed. On diluting the blue solution carefully 
with water, a point was reached where the color changed to 
brown. The solution was then allowed to stand. After a short 
time the substance began to separate in crystals.* 
perties.—The salt crystallizes in short, brown glittering 
needles. It is insoluble in water and alcohol. Moderately 
soluble in boiling acetic acid. The best way to obtain it in 
New Brunswick, N. J., April Ist, 1878. 
* It would be interesting to determine exactly at what point of dilution the 
acetic acid becomes equal to the phenol in its attraction to the copper. 
