ACETO ACETIC ESTER 23 



CONRAD, M. AND LEONARD LIMPACH, 1878. 

 Ann. Chetn. 192, 153-160; Ber. n, 1246; J. Chem. Soc. 34 781; 



Jsb. Chem. 1878, 706. 



Improved Method of Production of Mono- and Di-organic 

 Substituted Acetoacetic Esters. 



Add the ester to a solution of sodium ethoxid made by dissolving 

 sodium in absolute alcohol and then add the alkyl iodid. The products 

 are obtained very free from the byproducts which are formed in the 

 usual methods. 



PRECHT, H., 1878. 



Ber. n, 1193-1195; J. Chem. Soc. 34, 970; Jsb. Chem. 1878, 706. 

 Action of Ammonia on Acetoacetic Ester. 



By this action the compound C 6 H XI NO 2 is formed. It is insoluble 

 in water, soluble in alcohol and ether, and is decomposed by heating. 

 It is probably an amid and is isomeric, not identical with the substance 

 which Geuther obtained and called ammonium ethylene-dimethylene 

 carbonate.* 



*See pages i and 6. 



HARROW, GEO. H. U., 1878. 



J. Chem. Soc. 33 425-438 ; Ann. Chem. 201, 141 ; Jsb. Chem. 1878, 731. 

 Pyrotritartaric and Carbopyrotritartaric Acids. 



Diacetosuccinic ester CH 3 CH 3 



CO CO 



CH- -CH 



CO 2 C 2 H 5 CO 2 C 2 H 5 made from sodacetoacetic 



ester and iodin, is crystalline and melts at 78-79 This treated with 

 dilute sulfuric acid yields the two acids, pyrotritartaric or uvic C 7 H 8 O 3 

 melting at 135- 136 and Carbopyrotritartaric, C 8 H 8 O 5 which melts at 

 3ir Carbopyrotritartaric acid heated gives pyrotritartaric acid 



