556 Royal Society : — 



a corresponding transformation under the influence of sulphuretted 

 hydrogen. 



C M H 8 N 4 ,(HN0 8 ) a +2H a S = 2C n H S + 2HNO 3 +4N. 



Nitrate of diazophenyl- Phenyl-raercaptan. 



diammonium. 



It is ohvious that the last reaction supplies a general method for 

 the production of the mercaptans belonging to the homologues of 

 the phenyle-series, the first representative of which was discovered a 

 few months ago by Vogt, who obtained it by submitting the chloride 

 of sulpho-phenyle to the action of hydrogen. 



"Reproduction of Non-nitrogenous Acids from Amidic Acids." 

 By Peter Griess, Esq. 



In several previous communications I have pointed out the exist- 

 ence of a peculiar double acid, 



formed by the action of nitrous acid on amidobenzoic acid. This 

 acid, which I have designated as amidodiazobenzoic acid, when 

 again submitted in the presence of hot alcohol to the action of 

 nitrous acid, is changed according to the following equation : — 



C u H n N 3 4 +2C 2 H 6 + HN0 2 = 2C 7 H 6 2 +2C 2 H 4 + 2H 2 0-f4N. 



Double acid. Alcohol. Nitrous Non-nitroge- Aldehyde, 

 acid. nous acid. 



The non-nitrogenous acid thus reproduced exhibits the composi- 

 tion of benzoic acid ; it differs, however, in its properties essentially 

 from that acid. Since the publication of Kolbe and Lautemann's ex- 

 periments on salylic acid, I have found that the acid in question is 

 identical with the latter. 



Salylic acid may be much more readily obtained by submitting an 

 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 = C 7 H 6 2 +C 2 H 4 + 2H 2 0+2N. 



Amidoben- Alcohol. Nitrous Salylic Aldehyde, 



zoic acid. acid. acid. 



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 c 2 C 7 H 3 (N0 2 )0 2 C 7 H 3 (H 2 N)0 2 C,H 6 2 



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



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



Toluicacid. Nitrotoluic acid. Amidotoluic acid. Homologue 



of salylic acid. 



