64 ELECTROLYSIS AND ELECTROS 'YN THESIS 



sulphate by the reduction of nitro-benzene-sulphonic 

 acid. 



Noyes and Clement, 1 on the reduction of nitro- 

 benzene in a concentrated sulphuric acid solution, 

 obtained p-amido-phenol-sulphonic acid. Gatter- 

 mann, a starting with a similar solution, by varying 

 the conditions of the experiment obtained directly 

 p-amido-phenol. He explains the reaction by assum- 

 ing the intermediate formation of phenyl-hydroxyl- 

 amine, which on further reduction changes by molec- 

 ular rearrangement into the final product. By similar 

 treatment were formed: 



an amido-cresol-monosulphonic acid 3 from o-nitro- 



toluene; 



the o-p-diamido-phenol from m-dinitro-benzene; 

 diamido-cresol from o-p-dinitro-toluene; 

 o-p-diamido-phenol from m-nitr aniline; 

 a diamido-cresol from o-nitro-p-toluidene; 

 the same diamido-cresol from p-nitro-o-toluidene; 

 an amido-salicylic acid from m-nitro-benzoic acid; 

 an amido-cresotinic acid from m-nitr o-p-toluic acid; 

 a corresponding amido-oxy acid from nitro-terephthalic 



acid; 

 a corresponding amido-oxy-acid from nitro-isophthalic 



acid; 



1 Chem. Ber., 26, 990. 

 8 Ibid., 26, 1840. 

 8 Ibid., 27, 1929. 



