1866.] 



Rosaniline to Rosolic Acid. 



213 



On comparing the formula of rosolic acid given tlius by Griess*s pro- 

 cess applied to rosaniline, we find that it differs from the formula deduced 

 from Kolbe and Schmitt's analysis, viz. 



OCe H, 



0C3H; 



OH 



by one atom of oxygen. 



"We are inclined to think that this difficulty must be got over by cor- 

 recting the formula deduced from Kolbe and Schmitt's research. If ^the 

 numbers required by the formulae C^g H^g O^ and H^g O^ be calculated, 

 it will be found that both of them fall sufficiently near the analytical 

 results actually obtained to allow of the deduction of either from the 

 analyses. 



Taking the latter, viz. H^g O^, all will become intelligible : — 



Rosolic Acid. 



o a H. 



^20 



Type. 

 fH 

 H 

 H 

 H 

 H 



0. = C,<^^eH, 



|h 



I^HO 



Thus rosolic acid appears as an ethyl-hydride, and its generation in the 

 Griess process applied to rosaniline is obvious. To the formula 



OC,H, 



oa 



which is derived from rosaniline by the straightforward action of nitrous 

 acid and water, we have to add O, and we get 



fOCeH, 



H 



which is, as was said, a possible expression of the. analyses of the rosolic 

 acid obtained from carbolic acid. 



