ACETO ACETIC ■ ESTER 71^ 



CONRAD, M. AND LEONARD LIMPACH, 1878. 



/Ann. Cliem. 192, 153-160; Ber. 11, 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 

 1 usual methods. 



PRECHT, H., 1878. 



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



Action of Ammonia on Acetoacetic Ester. 



By this action the compound C6 H„ NO2 is formed. It is insoluble 

 in water, soluble in alcohoLand 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., 18^8. 



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

 Pyrotritartaric and Carbopyrotritartaric Acids. 



Diacetosuccinic ester CH. -^^3 



CO CO 



CH CH 



CO2 C2 H5 CO2 C2 H5 made from sodacetoacetic 



ester and iddin, is cr\-stalline and melts at 78°-79° This treated with 



dilute sulfuric acid yields the two acids, pyrotritartaric or uvic Cy Hg O3 



melting at 135-°- 136° and carbopyrotritartaric, Cs Hg O5 which melts at 



-.23o°-23i° Carbopyrotritartaric acid heated gives pyrotritartaric acid 



