OF THE SO-CALLED ELJEOMARGARIC ACID. 7 



The anilide of elœomargaric acid dgHgiO . NH CeHg requires 

 ^=3.949^, while the addition product of the anilide with one 

 molecule of aniline requires N=6.259^. 



The product above obtained must therefore be the anilide 

 of elœomargaric acid and is still unsaturated. To the glacial 

 acetic acid solution of the anilide of m. p. 80°, bromine was added 

 drop by drop until the red colour of bromine no longer dis- 

 appeared ; on cooling with ice, a white precipitate was obtained, 

 whose m. p. was found to be about 95°. 



The non-formation of aniline addition product may be taken 

 as an indication that the double bonds in elseomargaric acid are 

 not near the carboxyl group. 



Esters of elceomargaric acid. 



Methyl and ethyl esters of elœoraargaric acid were prepared 

 by the usual method. The methyl ester decomposed on warm- 

 ing, becoming dark coloured and giving off a disagreeable odour. 

 But the ethyl ester was stable and of a transparent yellow colour, 

 distilling at 230-240° under a pressure of 25 m.m. 



From the ethyl ester, a bromine addition-product was pre- 

 pared by the usual method, which was at first a colourless, 

 transparent liquid, but on standing it gradually became dark 

 coloured. 



Since my first pajjer on eleeomargaric acid appeared in 1903, 

 the only literature on this subject which I have been able to 

 find, is a paper by Moritz Kitt (Chem. Rev. Fett- u. Harz- 

 lud., II, 190-191), which, however, I have only seen in abstract 



