216 Proceedings of the Royal Irish Academy. 



(A to A), the reactions being, however, allowed to progress for shorter 

 periods (ten days to five weeks). 



1. The tlask to which I molecular amount of nitric acid had been added 

 contained at the end of ten days a mixture of an orange and yellow solid : 

 the carbon tetrachloride solution had an orange-yellow colour. 



From the solid, 2.10-dinitro diphenylaminc (possibly formed by decom- 

 position of its unstable nitroso derivative) was separated by recrystallisation 

 from chloroform and alcohol. 



When the carbon tetrachloride filtrate was distilled a mixture of a yellow 

 and n reddish solid remained in the flask. The red solid was separated from 

 the yellow one by boiling with ligro'in in which it was nearly insoluble. It 



( aiBted of 2.10-dinitro-diphenylamine. The yellow solid was recovered 



from the ligro'in and dissolved in hot alcohol, from which it separated in the 

 form of pale-yellow crystals which melted at K'.l.o-K'.i'.o ('. It gave a deep 

 violet colouration with concentrated sulphuric acid, and consisted of i-nitro- 

 dipfu nylnitro 



By concentrating the alcoholic filtrate from the latter substnnce a small 

 am •mil of BOinewhal impui ro- diphenylaminc was obtained, the 



occurrence of which was probably due to decomposition of its nitroso 

 derivative during the operations by which the nitroso compound was 

 purified. 



:'. In the tlask to which 2-nwUcular amounts of nitric acid had been added 



which, when washed with alcohol and chloroform, was light. 



ow in colour, melted between 150 and 155 C, and was a mixture of dinitro- 



consisting mainly of 2.10 dinitro dipJienylnitrosamine. 



-red solid which separated from the alcohol-chloroform washings 



recry8tallised from glacial acetic acid. In this way 



btained. 

 « >n further concentrating the parent liquids, light yellow-coloured crystals, 

 melting al -Ml' I e a violet colouration with 



alcoholic ml consisted of 4.10- dinitro- diphenylam 



■on tetrachloride filtrate was evaporated, ami the golden-yellow 

 i, which remained, were recrystallised from ligro'in. They melted at 



162 lentical with the lescribed in A3, ami consisted of 



slightly imp Phe 'lid which had remained 



undissolved by the ligro'in was found to be 4-nitro- dipJienylnitrosamine. 



■".. From the solution to which 3-moUcular amounts oi nitric acid had been 

 itained, a- in the . iriment, a -olid consisting of a mixture 



Mel from the carbon tetrachloride filtrate we 

 isol '- ami 4.1U-<'i'/m7/. 



