267 



alcoholic solution of amido-benzoic acid itself to the action of nitrous 

 acid. 



C 7 H 7 N0 2 + C 2 H 6 0+HN0 2 = 



Amidoben- 

 zoic acid. 



Alcohol. 



Nitrous 

 acid. 



Salylic 

 acid. 



Aldehyde. 



Nearly all the amidic acids I had an opportunity of examining 

 exhibit a similar deportment, furnishing a non-nitrogenous acid 

 isomeric or identical with the acid which, by conversion into a nitro- 

 compound and subsequent reduction, had given rise to the formation 

 of the amidic acid. In the following cases I have experimentally 

 established this transformation. 



C 7 H 6 2 C 7 H 5 (N0 2 )^ C 7 H 5 (H 2 N)0 2 C 7 H 6 O 2 



Benzoic acid. Nitrobenzoic acid. Amidobenzoic acid. Salylic acid. 

 C 8 H 8 2 C 8 H 7 (N0 2 )0 2 C 8 H 7 (H 2 N)0 2 C u EL (X 



Nitrotoluic acid. Amidotoluic acid. 



Toluic acid. 

 C 8 H 8 3 C 8 H 7 (N0 2 )0 3 C 8 H 7 (H 2 N)0 3 



Anisic acid. Nitranisic acid. Amidanisic acid. 



Homologue 

 of salylic acid. 



C 8 H 8 3 



Anisic acid. 



C 6 H 4 (N0 2 ) 2 C 6 H 3 (N0 2 ) 3 C 6 H 3 (NO 2 ) 2 (H 2 N)0 C 6 H 4 (NO 2 ) 2 O 



Dinitrophenylic 

 acid. 



Trinitrophenylic Dinitramidophenylic 

 acid. acid. 



Dinitrophenylic 

 acid. 



It deserves to be noticed, that while amidobenzoic and amidotoluic 

 acid furnish acids isomeric respectively with benzoic and toluic 

 acid*, anisic and dinitrophenylic acid are re-obtained with all their 

 original properties. The properties of salylic acid, and of its deriva- 

 tives, render it probable that salylic acid and not benzoic as was 

 hitherto assumed is in the group of aromatic acids the true repre- 

 sentative of acetic acid. Salylic, chlorosalylic, and salicylic acids ex- 

 hibit in fact the same intimate relations which obtain between acetic, 

 chloracetic, and glycolic acids. It is true the same relations may 

 be traced in the composition of benzoic, chlorobenzoic, and oxyben- 



* The acid C 8 H s 2 , described by Strecker, probably belongs to a different 

 group of compounds. In its transformations, and more especially in its conver- 

 sion under the influence of oxidizing agents, into oil of bitter almonds, it differs 

 both from toluic acid and the homologue of salylic acid. P. G. 



