— 188 — 



red crystals, m. p. 235 to 236° (from glacial acetic acid); bromopaeonol- 

 p-nitrophenylhydrazone, orange needles, m. p. 222° (from glacial acetic 

 acid); pasonol-m-nitrophenylhydrazone, red tables, m. p. 197° (from glacial 

 acetic acid); bromopasonol-m-nitrophenylhydrazone, dark red prisms, 

 m. p. 217° (from glacial acetic acid); bromo paeonol-o-nitrophenylhydra- 

 zone, red needles, m. p. 253 to 254°. 



According to G. Peron x ), the root of Pceonia Moutan does not contain 

 pseonol in the free state, but combined in a glucoside-like form. By 

 hydrolysis, as well as by the action of a ferment which is also present 

 in the root, the glucoside-like compound is split up into paeonol and in 

 a dextrorotatory variety of sugar. 



On phenol-, cresol- and carvacrol-«-naphthyl urethanes, see Alcohols, 

 p. 172. 



Acids. 



The investigations of Gardner, Perkin and Watson 2 ) on various cyclo- 

 hexanone carboxylic acids, to which we referred in our last Report, have 

 since been published, with full experimental details, in the Journal of the 

 Chemical Society 3 ). 



Camphenic acid. Aschan 4 ), basing on theoretical considerations, 

 for the exposition of which we have no space here, gives the two following 

 formulas for camphenic acid (camphene-camphoric acid) 5 ) 



CH 2 — CH • C (CH 3 ) 2 • COOH CH 2 — CH 2 



CH 2 



CHC(CH 3 ) 2 C0 2 H 



CH 2 — CH-C0 2 H CH 2 — CHC0 2 H 



1 II 



Aschan then proceeds to discuss these formulae, expressly pointing out, 

 however, that his remarks must not be taken as a definite solution of 

 the problem. 



The author's method of preparing camphenic acid was as follows: 

 25 g. camphene was dissolved in 5 g. benzene to liquify it; it was then 

 diluted with a solution of 7,5 g. potassium hydroxide in V 2 1- water and 

 slowly oxidised by the careful addition of a solution of permanganate of 

 potassium (64 g. permanganate to 3,2 1. water). The last decoloration 

 usually requires a few hours for its accomplishment; the whole process 



*) Journ. de Pharm. et Chim. VII. 3 (1911), 93, 238. 



2 ) Report October 1910, 202. 



3 ) Journ. chem. Soc. 97 (1910), 1756. 

 *) Comp. Report October 1904, 111. 

 ») Liebigs Annalen 375 (1910), 336. 



