74 BIBLIOGRAPHY OF 



it were obtained lutidin-dicarboxylic ester and acid. Hydroisobutyl- 

 lutidindicarboxylic ester, C 5 N (CH 3 ) 2 C 4 H 9 H 2 (CO 2 C 2 H 5 ) 2 , obtained 

 by using valeraldehyde melts at ioo. The mono-ethyl salt and free 

 acid of isobutyl-lutidin dicarboxylic were obtained and also isobutyl- 

 lutidin, C 5 N (CH 3 ) 2 H 2 C 4 H 9 , a liquid boiling at 210 to 213. 



FITTIQ, R., 1885. 



Ber. 18, 3410-3413 ; J. Chem. Soc. 50, 225. 

 Constitution of Carbopyrotritartaric Acid. 



The product of the action of acetoacetic ester and succinic acid, 

 Cg Hg O 5 , which is isomeric with Carbopyrotritartaric acid is called 

 methronic acid and the two acids are given the following formulse : 

 Carbopyrotritartaric acid : 



CH 3 C C HC0 2 H 



II I 



H C CHC0 2 H 

 \ / 

 C 



Methronic acid : 



CH 3 C C HC0 2 H 



II I 



CO 2 H C CH 2 

 \ / 

 C 



When heated they both give carbon dioxid and pyrotritartaric acid 



CH 3 C CHCO 2 H, 



II I 



H C CH 2 

 \ / 

 C 

 II 



o 



