202 Arppe on Nithialine 



out in thin colourless laniinfe, which melt at 175°, and sublime 

 at a higher temperature without much decomposition. 



When malanilide is boiled with concentrated solution of potash, 

 a remarkable change takes place. The greater part of it is taken up 

 by the potash, and at the same time a slimy body is formed which 

 floats on the surface. On the addition of water, the substance, 

 which is partially dissolved in the potash, is separated out as a 

 white insoluble powder. By repeated washing with water this 

 is obtained free from potash, and may then be crystallized from 

 alcohol. The form, analysis and properties of this body prove 

 it to be tartanilide, C^^ H^ NO"*. This only differs from malani- 

 lide by containing one atom more of oxygen, but the change 

 produced by the potash is not so simple as the formation of the 

 slimy body shows. 



The solution of the malanile is slightly evaporated, and any 

 dissolved malanilide is separated by filtration. It is then puri- 

 fied by treatment with animal charcoal and crystallization. It 

 crystallizes easily, and in forms which vary with the concentra- 

 tion of the solution. It melts at 170° C. When boiled vsdth 

 aqueous ammonia it is changed into malanilic acid, which forms 

 with the ammonia a heavy crystalline salt. The acid is separated 

 by treating the ammonia salt with baryta water, and carefully 

 decomposing the baryta salt formed with sulphuric acid. The 

 slightest excess of sulphuric acid reconverts it into malanile. 

 It crystallizes in small grains, expels carbonic acid from its salts, 

 forming with the bases salts which are mostly soluble. Its for- 

 mula is C^°H" NO^, i. e. 2 equivs. malic acid and 1 equiv. ani- 

 line, minus 2 equivs. water. 



By heating malanile with nitric acid, the nitrocompound ia 

 formed, but so mixed with a resinous matter that it is impossible 

 to separate them. 



Hofmann and Muspratt found that when dinitrobenzole is 

 treated with sulphuretted hydrogen, paranitraniline is formed 

 with separation of sulphur, 



Ci2(H4NO'')NO'* + 6HS = C'2(H6N04)N-F4HO + S. 

 In treating dinitrobenzole by ammonia and sulphuretted hydro- 

 gen, Arppe observed that the reaction was more complicated, 

 for in addition to sulphur there separated out hyposulphite of 

 ammonia, and a small quantity of an organic sulphur compound 

 which appears to be a weak base. 



This body may be obtained by dissolving out the hyposulphite 

 of ammonia with water, and the sulphur with bisulphide of car- 

 bon. It is difficultly soluble in hydrochloric acid, from which 

 it is easily separated by alkalies. It is best purified by treat- 

 ment with excess of strong SO^, which dissolves it, and from 



