ACETO ACETIC ESTER IO3 



KNORR, L., 1889. 

 Ber. 22, 146-152 ; J. Chem. Soc. 56, 384. 

 Constitution of Carbopyrotritartaric Acid. 



Fittig gives this acid the unsj'mmetrical formula 



CH3-C CHCO2H, 



II I 



HC CHCO2 H 



\ / 



C 



O 



while the author gives it a sj^mmetrical one : — 



CO2HC-CCO2H 



II II 

 CH3 C CCH3 



\ / 

 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, dg H32 N2 Og, is formed from rhamnose, CH3 

 (CH0H)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. 



