ACETO ACETIC ESTER 10} 



KNORR, L., 1889. 



Ber. 22, 146-152 ; J. Chem. Soc. 5<* 384. 

 Constitution of Carbopyrotritartaric Acid. 



Fittig gives this acid the unsymmetrical formula 



CH 3 -C CHC0 2 H, 



|| 



HC CHC0 2 H 

 \ / 



C 



o 



while the author gives it a symmetrical one : 



CO 2 HC-CC0 2 H 



II II 

 CH 3 C CCH 3 



\ / 

 O 



and says that this formula is proven by the fact that only one pyrotri- 

 tartaric acid and only one hydrogen-ethyl ester can be formed from it. 



RAYMANN, B. AND K. CHODOUNSKY, 1889. 



Ber. 22, 304-305 ; J. Chem. Soc. 56. 485. 



Rhamnodiazin. 



Rhamnodiazin, ds H 32 N 2 Og, is formed from rhamnose, CH 3 

 (CHOH) 4 CHO, and ammonia and acetoacetic ester in methyl alcohol 

 solution. It melts at 186. Other glucoses seem to yield similar com- 

 pounds when treated with acetoacetic ester and ammonia. 



