ACETO ACETIC ESTER 29 



WISLICENUS, J., 1880. 



Ann. Chem. 206, 308-313 ; J. Chem. Soc. 40, 409 ; Ber. 14. 843 ; Jsb. 

 Chem. 1 88 1, 502 ; Bull. Soc. chim. 36, 657. 



Decomposition of Polybasic Acetoacetic Esters by Alkalis. 



By a great number of experiments it was found that the proportion 

 of ketone or ketonic acid and carbonate increased with the dilution of 

 the alkali and the proportion of acetates or substituted acetates increased 

 with the concentration of the alkali ; also that isomers do not give the 

 same proportions of like products. 



BISCHOFF, CARL, 1880. 



Ann. Chem. 206, 313-337 ; J. Chem. Soc. 40, 412 ; Jsb. Chem. 1881. 



744 ; Ber. 14, 844. 



Two liomologues of Aceto=propionic Acid. 



/9-Aceto-isobutyric or «-methyl-aceto-propionic acid, CH3 CO CH, 

 CH (CH,) CO2 H, and ;9-aceto-butyric acid, CH, CH (COCH3) CH^ 

 CO2 H, were described together with their production and their salts. 



CLAISEN, L., 1881. 



Ber. 14, 345-349 ; J- Chem. Soc. 40, 405; Jsb. Chem. 1881, 580 ; Bull. 



Soc. chim. 36' 357. 

 Condensation of Aldehyde with Acetoacetic Ester. 



The condensation is effected by passing hydrochloric acid gas through 

 a mixture of the substances. With acetaldehyde, acetethylidenacetic- 

 ester, CH3 CO C (CH CH3) CO2 C^ H5, is produced. It boils at 210° 

 to 212° and will take up two molecules of bromin. Acetobenzyliden- 

 acetic ester, CH3 CO C (CH Ce H5) CO2 C^ H5, produced similarly from 

 benzaldehyde boils at 295° to 297.° This also will take up two molecules 

 of bromin. 



