ACETO ACETIC ESTER I7 



RUCKER, AUG., 1877. 

 Ber. 10, 1954 ; Ann. Chem. 201, 54 ; j. Chem. Soc. 34» 292 ; Jsb. Chem. 



1880, 810. 

 Methyl Crotonic Acid. 



Methyl-acetoacetic ester. CH3 CO CH (CH3) CO2 C^ H5, treated with 

 phosphorus pentachlorid g-ives only one compound a-methyl y9-chlor 

 crotonic acid CH2 



C-Cl 



CH (CH3) 



CO2 H which melts at 69.5.° The barium, sodium and 

 silver salts and the ethvl ester were described. 



WOLFF, CARL, 1877. 



Ber. 10, 1956-1958 ; Ann. Chem. 201, 45 ; Jsb. Chem. 1877, 687. 

 Diallyl=acetoacetic Ester and its Derivatives. 



Diallylacetoacetic Ester, CH3 CO C (C3 H^)^ CO^ C^ H5, boils at 239° 

 to 241° and has a specific gravity of .948 at 25.° It is decomposed by 

 alkalis in two wa3'S forming (i) diallylacetone which boils at I74°-I75° 

 and (2) into diallylacetic acid which boils at 22i°-222° and has a 

 specific gravity of .949 at 25° To obtain the first product the alkali 

 is added cold and the substance is shaken out with ether. To obtain 

 the second add sulfuric acid to the dry mixture and the acid separates 

 as an oil. The barium, calcium and silver salts are described. 

 Possibly this diallylacetic acid C H (C3 1^5)2 CO2 H when oxidized 

 will give tricarballylic acid C. H^ TCOi H)3 since allylacetic acid 

 Sfives .succinic acid. 



MEYER, VICTOR, 1877. 



Ber. 10, 2075-2078; Jsb. Chem. 1877, 518 and 770. 

 Azophenylacetoacetic Acid. 



When azobeuzene nitrate Ce H5 N2 NO3 is treated with potassium 

 acetoacetic ester, azophenylacetoacetic acid CH3 CO CH (N2 Ce H5 ) 



