7. Allylammonium Nitrite. 
By PraFutta CHanpra RAy and Rasik Lat Datta. 
In continuation of the researches on the nitrites of the 
alkylammonium series, several of which, e.g., methylammonium 
nitrite (Ray and Rakshit, Journ. Asiatic Soc., 1911, vii, 91; 
Trans. Chem. Soc., 1911, xcix, 1016) ; ethylammonium nitrite, 
dimethylammonium nitrite, trimethylammonium nitrite (Ray 
and Rakshit, Trans. Chem. Soc., 1911, xcix, 1470) ; benzylam- 
monium nitrite and dibenzylammonium nitrite (Ray and Datta, 
Trans. Chem. Soc., 1911, xcix, 1475) have already been described, 
te. 
The preparation of the nitrite was effected by double decom- 
position between silver nitrite and allylamine hydrochloride, 
the end point being carefully hit off; and the clear solution was 
left to evaporate in a vacuum over sulphuric acid. Consider- 
able difficulty was experienced in obtaining pure allylamine, 
since the general method available for the preparation of most 
amines, namely, by the action of alcoholic ammonia on alkyl 
halides, is here unsatisfactory. By the interaction of allyl- 
bromide and alcoholic ammonia, the quaternary compound i 
but very slowly, requiring days ; and yet then it is the quater- 
nary compound that is produced. The base was, therefore, pre- 
by a special process. This consisted in the hydrolysis 
e 
contents of the flask became warm, and led to a violent 
reaction. It is well to cool the flask at this point to secure a 
slow but complete hydrolysis. The mixture was saturated with 
alkali, distilled, and the vapours led into hydrochloric acid 
solution. The solution was evaporated to dryness on the water 
bath; and the residue of crude allylamine hydrochloride thus 
obtained (admixed with ammonium chloride) was further dis- 
tilled with solid caustic soda, whereupon pure allylamine came 
over. After dehydrating it with fresh lumps of solid caustic 
soda, it distilled between 57-58". The purity of the amine was 
- further controlled by analysing the double platinic chloride— 
