Macbeth and Graham — Action of Sulphur Chloride on Ammonia. 37 



our disposal are given in the table below, and from these it appears that 

 sulphur chloride might with advantage be employed as a reagent for the 

 qualitative examination of organic bases. 



Primary Aromatic Amines. 









Solvent. 



Substance. 



















Benzene. 





Chloroform. 



Aniline. 



Eed-yellow 



precipitate 





Red-brown precipitate. 



o-Toluidine. 



Scarlet 



J) 





Red-brown solution. 



^-Toliiidine. 



Red 



,, 





Red precipitate. 



a-Naphtliylamine. 



Maroon 



,, 





Cbocolate precipitate. 



/3-Napbthylaniine. 



Scarlet 



>j 





Orange 



Benzidine. 



m Plienylene diamine. 



Green-blue 

 Yellow 







Dirty apple-green precipitate, 

 fading to dirty white. 



j»-Phenylene diamine. 



Green-blue 



- 







It seems probable that the colours obtained in the above reactions are 

 connected with the orientation of the amino groups in the molecule. Com- 

 pounds like benzidine and ^-plienylene diamine, for example, in which the 

 amino groups occupy similar positions, give similar colorations, whilst 

 m-phenylene diamine gives a precipitate of a different tint. 



[ Green-blue precipitate 



(Benzidine) 



-=< >- 



HjN<^ 



\_ 



^NHj 



(j3-phenylene diamine) 





\ 



(??i-phenylene diamine) 



/ 



/ 

 \ 

 \ 





\ 



^NHs Yellow precipitate 



JSfHj 



The nature of the products formed in the reactions with primary amines 

 has already received some attention. Edeleano' examined the action of 



Bull. Soc. Chim., 1891, (3) 5, 175, 



