102 BIBLIOGRAPHY OF 



PECHMANN, H. v., 1888. 



Ber. 21, 3005-3006 ; J. Chem. See. 56, 42. 



Condensation Product of Quinone and Acetoacetic Ester, 



When quinone, Ce H4 O2 , is brought in contact with acetoacetic ester 

 in the presence of zinc chlorid they react to form a substance C16 H16 Oe , 

 which melts at 184° This substance will not react with phenylhydrazin, 

 benzoic chlorid, sodium ethoxid or alkyl iodids. Treated with potas- 

 sium hydroxid and then an acid a crystalline dibasic acid C14H12O6 

 is formed which is insoluble in ordinary solvents and sublimes without 

 melting. The salt C14 Hio K2 Oe + 2H2O was prepared. 



CLAISEN, L. AND W. ZEDEL, 1888. 



Ber. 21, 3397-3398 ; J. Chem. Soc. 54» 377- 



Action of Chlorcarbonic Ester on the Sodium Derivatives of 



Acetylacetone, Acetoacetic Ester and Malonic Ester. 



The product obtained by treating acetoacetic ester with chlorcarbonic 

 ester was thought to be the dicarboxylic ester of acetoacetic ester and 

 to have the formula CH3 COC (CO2 C^ Hs)^ CO^ C^ H^.* 



CLAISEN, L., 1888. 



Ber. 21, 3567. 



A Correction. 



By further experiments the author has decided that the compound 

 formed from acetoacetic ester and chlorcarbonic ester is the mono- not 

 the di-carboxylic derivative of acetoacetic ester, that it is CH3 COCH 

 (CO2 C, H5) CO2 C2 H5 and not CH3 COC (CO^ C^ H5), CO^ C^ H5 as 

 stated by him in Ber. 21, 3397.! 



*See following article. 

 tSee preceding article. 



