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Chemistry. "On «- ami p-amyrin from bresk" 1 ). Ry Dr. X. 11. 

 Cohen. (Communicated by Prof. Van Romburgh). 



(Communicated in the meeting of November 24, 190ü). 



Communications as to /?-amyrin, which is present as acetate in 

 "bresk" or "djelutnjig" have already beer, presented (These Proc. 

 1905, p. 544). Since then, I have prepared also £-amyrin cinnamate. 

 This crystallises from acetone in small needles, which melt at 236, °5 

 (corr. 241 c ). 



In addition to /?-amyrin and lnpeol another substance was obtained 

 from "bresk", which proved to be identical with (he «-amyrin found 

 by Yesterberg. 



This substance crystallises from alcohol in long, slender needles; 

 m.p. 185° (corr. 186°). Yesterberg gives the melting point as 181 — 

 181°,5. 



Found: C 84.22 84/30 calculated for C 30 H 50 O 84.43 



II 11.91 L2.02 11.82 



These, like all subsequent combustions have been made with lead 

 chromate. 

 [«]z) = -j-82 ,6 in chloroform; in benzene was found [if]ö=-j-88°,2. 9 ). 



For the purpose of characterisation, different esters were prepared 

 from «-amyrin. 



«-Amyrin acetate was obtained by heating with acetic anhydride 

 and sodium acetate. Recrystallised from alcohol it forms needle- 

 shaped leaflets; m.p. 220—221°, (corr. 224— 225°). Vesterbkrg gives 

 the melting point as 221°. 



Found: C 81.85 82.27 81.79, calculated for C 8s H 6s O s 81.98 



H 11.34 11.40 11.33 11.19 



\_((]d = + 75°, 8 in chloroform. 



«-Amyrin benzoate was obtained with the aid of benzoyl chloride 

 and pyridine. From acetone it crystallised in long, prismatic needles ; 

 m.p. 192°, (corr. 195°). According to Vesterberg it melts at 192°. 



«-Amyrin cinnamate, which has not yet been described was obtained 

 like the benzoate. When recrystallised repeatedly from acetone it 

 forms small hard needles which melt at 176,5 — 177°, tcorr. 178°). 



Utrecht. Org. Chem. Lab. Univ. 



!) For a more elaborate description see, Diss. N. H. Cohen. 1906, Utrecht. 

 9 ) Vesterberg found in benzene [«]/> — -f- 91°,6. 



