1035 
If, for instance, we dissolve 0.5 gram of 2.3.4.-trinitrodimethyl- 
aniline in aleohol and add to the solution a few c.c. of strong aleo- 
holie ammonia a beautiful pale yellow product crystallizes after a 
short time, which when recrystallised from acetone melts at 162°. 
The nitrogen determination gave 24.70 and 24.52°/, N. 
calculated for C,H,(NO,), N(CH,), NH, 24.6°/, N. 
If, however, we heat this product (or the original substance melting 
at 154°) for some hours with alcoholic ammonia in a sealed tube 
at 125°, we find in the tube after cooling an abundant quantity of 
a substance crystallizing in brownish needles, which dissolves with 
great difficulty in the ordinary solvents. By recrystallisation from 
boiling methyl salicylate it could be obtained in beautiful pale brown 
or orange needles, which get decomposed at about 250°’). 
The elementary analysis gave the following result: 
C 36,22°/,, H3,55°/,, N 28,18°/,; calculated for C,H,(NO,),.(NH,) 
pooae),, da,0t },, N 28,28") - 
In the original mother-liquor of the brown needles in the tube, 
the presence of dimethylamine could be demonstrated. To ascertain 
this, it was acidified with hydrochloric acid and evaporated to dryness. 
0°? 2 
The residue — mixture of ammonium chloride and dimethylamine 
hydroebloride — was extracted with absolute alcohol. After distilling 
off the alcohol, there remained a little of a salt which, after being 
washed with absolute alcohol to remove traces of nitro-compound, 
was decomposed by boiling with aleoholie potassium hydroxide. 
The distillate gave with 1-bromo 2.4-dinitrobenzene, yellow crystals 
of 2.4.-dinitrodimethylaniline m.p. 87°, thus demonstrating the presence 
of dimethylaniline. 
The 2.3.4.-trinitrodimethylaniline yields with methylamine in alco- 
holie solution after a while yellow crystals of 2.4.-dinitro 3-methyl- 
aminodimethylaniline m.p. 125°. 
Nitrogen determination: Found 23.32°/, N. 
Calculated for C,H,(NO,), NHCH,N(CH,), 23.35°/, N. 
From this is formed on heating with methylamine at 125° in a 
sealed tube, a substance melting at 169°. 
Nitrogen determination: Found 25.0°/,; calculated for C,H, (NO), 
(NHCH,), 24.8°/, N. 
This compound already prepared by BrANKsMaA *) has the structural 
formula: 
1) Barr, B. 21, 1545 (1888). 
2) Rec. 27, 54 (1908), 
