102 Proceedings of the Royal Irish Academy. • 



6. S4.9-TrmUro-Diphenylamine (OA , ) ; C t5 H 3 XHC 6 H.N0 2 . 



According to Austen (Ber. d. Dtsch. Chem. Ges. vii (1874), p. 3250) 

 2.4.9-trinitro-diphenylamine melts at 1S0 = C, and according to Willgerodt 

 (Ber. d. Dtsch. Chem. Ges. Lx (1875), p. 1178) it melts at 1 94-1 95° C. 

 We obtained it by heating to 170-I80°C, for ten hours, an alcoholic solution 

 of 2.4-dinitro-bromo-benzene and m-nitraniline with sodium acetate and 

 cupric oxide. It consists of pale brown, platy crystals, which are difficultly 

 soluble in alcohol, acetic acid. or chloroform, and nearly insoluble in carbon 

 tetrachloride. It melted at 193-194°C. (uncorr.). 



Its solution in concentrated sulphuric acid had a faint yellow colour 

 which was not affected by addition of a trace of sodium nitrite. 



7. ?4.9-Trinitro-S-Melhyl-Diphenylamim 0,N .'II I IbXHC.H.NO,. 



Was formed by heating 1 g. of y-trinitro-toluene with an equal weight 

 of m-nitraniline in alcoholic Bolution for two hours. The compound which 



urated was filtered and re-crystallised from alcohol. It melted with slight 

 decomposition at 199 C, and gave on analysis the following results; — 



0-1672 g. substance gave 26*2 1 c. moist nitrogen at 19° C. 

 and 7t>4 in. in. p. 



eorreeponding to N 18*1 

 1 II X,' >, requires N 17*6. 



24-9-Triniti-<—~-M'ih</l-Iii/'!>< nylamine consists of glistening dark-yellow 

 prisms which are sparingly Boluble in most organic solvents, excepting 

 acetone, in which they are moderately Boluble. Its solution in alcoholic 

 potash has an orange-red colour, while that in sulphuric acid (cone.) is 

 faint yellow, and remains almost unchanged on addition of a trace of 

 sodium nitrite. 



B 2.4./'-/ .:.:/. vyl-Diphenyla 



■ >.X,.,. B (C Il.XH.CJI.X". 



was prepared by a method similar to that just described, from 

 ■y-triuitro-tolueue and n-nitraniline after heating for thirty hours. After 

 re-crystallisation from a mixture of acetone and alcohol it melted with 

 slight decomposition at 210° •'.. and gave on analysis the following results: — 



01051 g. substance gave 166 cc. moist nitrogen at 23 c 1 . 

 and 760 m.m.p. 



corresponding to N 179 

 lii.O.X, requires X 17'6. 



