304 PROCEEDINGS OP THE AMERICAN ACADEMY 



act on 10 gr. of tribromtrinitrobenzol under the conditions de- 

 scribed in the preceding section. The phenomena observed in this 

 case were the same as those described for the normal propylate ex- 

 cept that a slight rise of temperature from the reaction was observed. 

 The solid deposited over night gave a strong test for sodic bromide 

 and a distinct test for sodic nitrite. The principal organic product 

 was obtained and purified in the way given under the normal propyl 

 compound until it showed the constant melting point 130°, when 

 it was dried at 100°, and analyzed with the following results: — 



0.2280 gr. of the substance gave on combustion 0.3876 gr. of car- 

 bonic dioxide and 0.1182 gr. of water. 



Calculated for 

 C 6 (OC 3 H 7 ) 3 (N0 2 ) 3 . Found. 



Carbon 46.51 46.36 



Hydrogen 5.43 5.76 



The substance gave no test for bromine when heated with cupric 

 oxide. A small amount of trinitrophloroglucine seemed to be 

 formed as a secondary product in preparing the substance analyzed 

 above. 



Properties of the Triisopropylether of Trinitrophloroglucine, 

 C 6 (OC 3 H 7 )3(N0 2 )3. — This substance crystallizes in plates often one 

 centimeter long, made up of flattened prisms united by their longer 

 sides. These prisms are terminated by two planes at an obtuse 

 angle to each other, and seem to belong to the monoclinic system. 

 It is white when first prepared, but gradually takes on an orange 

 color on exposure to the air. It melts at 130°, and is not very 

 soluble in cold ethyl or methyl alcohol, more soluble in hot; very 

 soluble in benzol or chloroform ; freely in ether, or acetone; soluble 

 in carbonic disulphide; slightly soluble in cold glacial acetic acid, 

 freely when hot; very slightly soluble in ligroine, and nearly 

 insoluble in. water whether cold or hot. The three strong acids 

 have no apparent action on it whether cold or hot. The best sol- 

 vent for it is boiling alcohol. 



Action of Sodic Benzylate on Tribromtrinitrobenzol. 



The sodic benzylate used was prepared as follows. To 1.3 gr. of 

 sodium mixed with anhydrous benzol and heated in a flask with a 

 return condenser, 6.5 gr. of benzyl alcohol were added in small 

 quantities at a time, and the heating continued until all the sodium 

 had disappeared, which usually was not till after four hours. The 



