262 Dr. Simpson on Dibromallylammonia. 



The residue, which was the hydriodate of the sethylated base, 

 was then dissolved in warm water, in which it is sparingly 

 soluble, and potash added to the solution. The sethylated base 

 being set free, precipitated in the form of a heavy oil, which was 

 well washed with water, dried over sulphuric acid in the vacuum 

 of an air-pump and analysed. The aqueous solution from which 

 the oil had separated, neutralized by nitric acid, gave, on the 

 addition of nitrate of silvei", an abundant precipitate of iodide of 

 silver. For this base I propose the name sethylodibromallyl- 

 ammonia. 



The following results were obtained on analysis : — 

 0'2433 grm. of base gave 0"3051 grm. carbonic acid and 

 0'J067 water. 



The per-centage composition calculated from these numbers 



'C^H^Br" 



agrees well with the formula N-< C^H''Br >, as shown by the 



following Table : — 



Theory. Experiment. 



283-00 100-00 



The formation of this base may be thus explained : — 



rC^H^Br^ rC^H'^Brn 



N<^ C^H^Br ^ + C<'H^I = N^ C^H^Br ^HI, 



. H J l.C^H^ J 



and 



rCSH^'Br^ rC^H^Br^ 



N4 C^H^Br ^HI + KO=N-^ C^H^Br ^ + KI + HO. 



LC^H'^ J [C^H^ J 



This body has an extremely bitter, pungent taste, and an odour 

 somewhat resembling that of nutmegs. It is insoluble in water, 

 but soluble in acids. It behaves like an alkali towards litmus- 

 paper, and is a stronger base than that from which it is derived, 

 as shown by its having the power of precipitating oxide of copper 

 from its salts. I would gladly have tried to sethylate this base 

 again, but was prevented by want of material. 



With the view of ascertaining whether or not dibromallyl- 

 ammonia could be obtained from the bromiuated bromide of pro- 

 pylene (C* H^ Br Br^) derived from propylene gas, I exposed this 

 body also to the action of an alcoholic solution of ammonia, under 

 exactly the same conditions, as in the case of the terbromide of 



