ACETO ACETIC ESTER 43 



hydrochloric acid and diethyl-acetoacetic acid, CH3 CO C(C2 115)2 

 CO2 H, is thus produced. It is very unstable, decomposing at 60 into 

 diethyl-acetone, CH3 CO CH (C2 H5)2, which boils at 135° to 137° 

 Diethyl-acetoacetate of sodium was produced. 



ELION, H., 1883. 



Rec* trav. chim. 2, 33-34 and 202-204 ; Ber. 16, 1368 and 2762. 



Diacetyl=acetic Ester. 



By treating ethyl-acetoacetic ester with water-free, sodium hydroxid 

 and the product with acetyl chlorid, ethyl-diacetyl-acetic ester was 

 produced, it boils at 235.° Acetoacetic ester treated thus gives diacetyl- 

 acetic ester which boils at 210° to 213° with some decomposition, its 

 specific gravity is i.i at 15° It is decomposed by boiling with water. 



* Original article not consulted. 



MATTHEWS, F. E., 1883. 

 J. Chem. Soc. 43. 200-207 ' ^^^- *^' ^37^- 



Condensation Products of Aldehydes with Acetoacetic Ester and 

 some Substituted Acetoacetic Esters. 



This article is almost the same as the one by Claisen and Matthews 

 in fAnn. Chem. 218, 170. The author concludes that all aldehyde 

 conden.sations with acetoacetic ester take place with the methylene 

 group and are easily accomplished because of the position of the 

 methj'lene group between the carbonyl and carboxjd groups, but that 

 stich condensations with mono-or di-substitution acetoacetic ester take 

 place in the methyl group and consequently are more difficult to ac- 

 complish. 



t See page 40. 



