ACETO ACETIC ESTER 5 1 



WESTENBERQER, BERNHARD, 1883. 



Ber. 16, 2991-2998 ; J. Cheni. Soc. 46, 581 ; Jsb. Chem. 1883, 978 ; 

 Bull. Soc. chim. 42, 444. 



Isonitroso Bodies. 



The action of hydroxylamin on acetoacetic ester is given on page 

 2996 of this article. From this reaction ^-isonitroso-butyric ester, 

 CH3 C (NOH) CH2 CO2 C2H5 , results which is very unstable. The 

 acid is formed from it. Isonitroso-methyl-acetoacetic ester, CH3 C 

 (NOH) CH (CH3) CO2 C2 H5 , and the corresponding ethyl- and di- 

 ethyl- products were produced from the corresponding substituted 

 acetoacetic esters, proving the reaction to be a general one. 



HANTZSCH, A., 1883. 



Ann. Chem. 222, 1-46 ; Ber. 17, 12 (C) ; Jsb. Chem. 1883, 1070 ; Bull. 



Soc. chim. 42, 502. 



Condensation Products of Acetoacetic Ester. 



Acetoacetic ester treated with sulfuric acid gives a condensation 

 product C18 H22 O9 , which is formed from four molecules of acetoacetic 

 ester by the separation of three molecules of alcohol. Its formula is 



( OH CO2 C2 H5 ) 

 C6 Hy ■] CO2H CO2 H f Ce H7 . When treated with potassium 

 (CO — O \ 



hydroxid and an acid it yields two products, i) Ce Hy -< CO ^ , called 



( CO2H 

 mesiten-lactone-carboxylic acid, and 2) its ethyl ester. The radical 

 (Ce H9)' being designated as mesiten. The mesiten-lactone-carboxylic 



CO2H 



I 

 acid or isodehydracetic acid hastheformula CH3 — C : C ■ C (CH3) : CH, 



I I 



O CO 



