ACETO ACETIC ESTER IOy 



added. This process gave a much better yield than any other method 

 tried. The product obtained is methyl-dehydrohexone carboxylic ester, 



CH 3 



C O -CH 2 

 ii I 



C CH 2 CH 2 , 



C0 2 C 2 H 5 



This is changed by hydrobromic acid into aceto-butyl-bromid, CH 3 CO 

 (CH 2 ) 4 Br, and this by sodacetoacetic ester into a-w-diacetylcaproate. 



CH 3 



CO 



CH (CH 2 ) 4 COCH 3 , 



C0 2 C 2 H 5 



Treating this with potassium hydroxid the free acid is produced and by 

 heating this carbon dioxid is given off and a-w-diacetyl-pentane, 

 CH 3 CO (CH 2 ) 5 COCH 3 , is obtained. Several derivatives of this are 

 described. 



FITTIG, R., FRITZ VON EYNERN AND ADOLF DIETZEL, 1889, 



Ann. Chem. 250, 166-211 ; J. Chem. Soc. 56, 592 ; 

 Ber. 22, 200 (C). 



Condensation of /3-Ketonic Esters with Dibasic Acids. 



After a discussion of the constitution of the products of condensation 

 of succinic and pyruvic acids with acetoacetic ester, it is decided that 

 they are all derived from, either 



CH:CH /CH:CH 



Pyrotritartaric acid is now called uvitic acid and carbpyrotritartaric 

 acid is now called carbuvitic acid. When acetoacetic ester, acetic 

 anhydrid and sodium succinate are heated together they give hydrogen 



