202 Proceedings of the Royal Irish Academy. 



"2-4 - S- 1 0-tetra n Uro-diphenyla m inc. From the chloroform filtrate a small quantity 

 of 4T0-dinitro-diphenylamine was isolated in addition to other, lower melting, 

 impure substances. 



10. The behaviour of another diphenylnitrosamine solution to which 

 24c.es (4 mols.) of nitric acid had been added was quite similar to that of 

 the las;. The yellowish-white solid which separated from the acetic acid on 

 - tiding weighed 1*3 grams, and the orange-yellow solid which was precipi- 



y addition of water to the acetic acid filtrate weighed I '5 grams. 

 From the latter solid were isolated in a pure condition 2'i'810-teiranitro- 

 diphenylamine and i'10-dinitn - 



11. In this experiment the amount of nitric acid used was 36 c.cs (6 7>iols.). 

 The i.eha\ iour of the solution differed from that described under Experiment 9 

 only by its colour at the end of the second week being yellow, instead of 

 orange-yellow. I d which separated from the acetic acid solution on 



iding weighed l*5g ind that got from the filtrate by dilution with 



water weighed 1 ■"• grams. The latter solid was washed with alcohol and 

 chloroform. The residue when reerystallized from xylene melted, not quite 

 sharply, about 193 C, and proved t<i be slightly impure '2--iS'lO-fiirani(iv- 

 dipfu The alcohol-chloroform filtrate on evaporation gave an orange 



i. which melted over a wide range of temperature. 



12. In auother experiment 4 grams of dlphenylnitrosamine were dissolved 

 in i' id and 7'2 I of nitric acid (sp. gr. 143) 



ded. After a fortnight at the temperature of the laboratory the light- 

 yetlow-coloured solution was filtered from 34 grama of 2*10 dinUro-diylimyl- 

 iiid the filtrate on dilution with wab b 2*5 grams of a yellow, 

 oily solid from which chlorofoim and alcohol removed the lower melting com- 

 pounds, leaving a Bubstance which, aftei r© i j stallization from xylene, weighed 

 0*6 gram, and cone ly pure 2 m 4'8'10-UtrafUlro-dipheriylamine. From 



the chloroform-alcohol patent liquid a somewhat oily solid was obtained, and 

 this, after boiling with al potash and recrystallization from alcohol, 



melted at 125-14? 



which was obtained in several of the 



g experiments, consisted of pale-yellow prisms, melting at H ,v 200 I . 



It was very slightly in sold alcohol, ether, or chloroform, dissolved 



in.] e ive on analysis the following 



rest i Its: — 



0*1900 gram nil - I ecu ol nitrogen 



at L5° C. and 753 m.m.p. 



j] nding to N 20*08. 

 (J .11. N O, requires N 20 



