274 L. Remsen on Parasulphobenzoic Acid. 
Art. XXX.—Jnvestigations on Parasulphobenzoic Acid ; by 
IRA REMSEN. ; 
(Continued from page 186.) 
Il. Formation of Parasulphobenzoie Acid from Sulphotoluenic 
; Acid. 
WHEN substituting agents are allowed to act upon toluene, 
in the case of derivatives containing one substituting group, 
two products are formed. ‘These are the para- and ortho- varie- 
ties. The former is always produced in much larger quantity 
than the latter. This has been proved by Engelhardt and 
by partial crystallization of the potassium salts. In this way 
—— bichromate. Taking advantage of the suggestion of 
. 
ichromate in noted proportions. The oxidation, when once 
commenced by gently heating over a water-bath, proceeds rap- 
idly to the end without the further aid of heat, and is com- 
* Zeitschrift fir Chemie, N. F. 5, 615. + Ibid., N. F. 6, 321. 
t Zeitschrift fir Chemie, N. F. 7, 179. 
ogee salts to the influence of sulphuric acid and potassium 
