ACETO ACETIC ESTER IO7 



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

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



CH3 



C — O — CH3 

 II I 



C — CH2 — CH2 , 



I 



C02 C2 H5 



This is changed by hydrobromic acid into aceto-butyl-bromid, CH3 CO 

 (CH2)4 Br, and this by sodacetoacetic ester into a-w-diacetylcaproate. 



CH3 

 I 

 CO 



CH— (CH2)4COCH3, 

 I 

 CO2 C2 H5 



Treating this with potassium hj^droxid the free acid is produced and by 

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

 CH3 CO (CH2)5 COCH3, is obtained. Several derivatives of this are 

 described. 



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



Ann. Chem. 250, 166-21 1 ; J. Chem. Soc. 56, 592 ; 

 Ber. 22, 200 (C). 



Condensation of ^9=Ketonic Esters with Dibasic Acids. 



After a disciission 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 



'^'''^CH2CH2 °^^^°-^^0«>^CHtH2. 



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 



