140 



M. Schmidt on some New Acids. 



Schmidt*, in a preliminary notice, states that experiments he 

 has made show that these acids are not identical. At the same 

 time he describes the action of nitrous acid on sulphanilic acid. 

 By this action a new body is formed which crystallizes in needle- 

 shaped crystals. It has the formula C 12 H 4 N 2 S 2 O 6 , and may 

 be regarded as phenylsulphuric acid in the phenyle of which 

 two atoms of hydrogen are replaced by two atoms of nitrogen : 



C 12 H 3 1 

 thus, HO, -^2 f S 2 O 4 , 0. Schmidt names it diazosulpho- 



phenylic acid. It has acid properties, but is very unstable. When 



its aqueous solution is heated to 60°, a decomposition ensues 



accompanied by a copious disengagement of pure nitrogen. The 



acid liquid now contains a new acid, oxyphenylsulphuric acid. 



C l2 H 4 "1 

 HO, TTQ2 >S 2 O 4 , 0, which is phenylsulphuric acid in which 



an atom of hydrogen in the phenyle is replaced by peroxide of 

 hydrogen. The formation may be thus expressed : — 

 C i2 H 4 N 2 S 2 6 + 3H0 m C 12 H 6 S 2 8 + 2N. 



Diazophenylsulphuric 

 acid. 



Oxyphenylsulphuric 

 acid. 



Oxyphenylsulphuric acid corresponds to oxybenzoic acid, and 

 diazosulphophenylic acid to diazobenzoic acid, the remarkable 

 body obtained by Griessf by the action of nitrous acid on alco- 

 holic solution of benzamic acid. Schmidt considers that in all 

 cases in which amidized acids, such as amidoacetic acid, are con- 

 verted into oxyacids, intermediate bodies, of which diazobenzoic 

 acid is a representative, are first formed. Hence we might anti- 

 cipate that between glycocol and glycolic acid, and between ala- 

 nine and leucic acid, intermediate bodies corresponding to diazo- 

 benzoic acid will be found to exist. A comparison of the for- 

 mulae will show these relations more clearly. 



HO ' C ' 8 JJ 4 H9 }c 2 2 ,0 HO,C««J£j.C ,1 0«,0 HO.CwJJj.JcW.O. 



Amidobenzoic acid. 



HO 'Th*>o*o 



Amidoacetic acid 

 (glycocol). 



HO,C 4 H 4 



Diazobenzoic acid. 



■} 



ctie 

 KOl 



NH .}c«o»,o 



Amidopropionic acid 

 (alanine). 



HO,C 2 H 2 



N 2 



|c 2 o 2 ,o 



Intermediate body. 



HO,C 4 H 3 



H 3 1 

 £ 2 |C 2 2 ,0 



Intermediate body. 



Oxvbenzoic acid. 



Oxyacetic acid 

 (glycocol). 



H0,C 4 H 4 1 



HO 2 J L u ' u * 



Oxypropionic acid 

 (lactic acid). 



* Liebig's Annalen, October 1859. 

 t Phil. Mag. vol. xvii. p. 371. 



