ACETO ACETIC ESTER 93 



are amido-crotonic-esters and not imido-butyric esters. An interesting 

 fact is noted in regard to the melting points of these compounds. In- 

 troducing a methyl into the 7}iethyl ester lowers the melting point 26° 

 and introducing an ethyl lowers it 8°, while in the ethyl ester the intro- 

 duction of a methyl raises the melting point 15° and the introduction of 

 an ethyl raises it 23.° 



JAPP, FRANCIS AND FELIX KLINGEMANN, 1887. 

 Ber. 20, 3284-3286 and 3398-3401. 



Benzene=azo= and Benzenehydrazopropionic Acids. 



Discussion is taken up in regard to the constitution of the benzene- 

 «-azopropionic acid, before described, and the formula is changed to 

 CH3 C (: NH = N — Ce H5) CO, H, as it is found to be identical with 

 phenylhydrazin pyroracemic acid. 



PETERS, T., 1887. 



Ber. 20, 3318-3324 ; J. Chem. Soc. 54» 253 ; Jsb. Chem. 1887, 3318 ; 

 Bull. Soc. chim. 49, 696. 



Action of Aqueous Ammonia on Alkylated Acetoacetic Esters and 



of Alcohols on the Carboxylic Alkyl Group in 



Acetoacetic Esters. 



Repeating Brandes' experiment with aqueous ammonia, the author 

 obtained with ethyl-acetoacetic ester besides amido-ethyl-acetoacetic 

 ester, an ethyl-acetoacetamid, CH3 COCH (C, H5) CONH, melting at 

 96° which is undoubtedly Brandes' second body. Methyl-, isobutyl- 

 and isoamyl-acetoacetamids were obtained from the corresponding 

 esters ; they melt respectively at 73°, 85" and 127^ The author finds that 

 the isobutyl and isoamyl esters may be readily prepared by the action 

 of the respective alcohol on the ethyl ester, especially in the presence 

 of a small quantity of sodium. 



