ACETO ACETIC ESTER 91 



HANTZSCH, A. AND H. Z'URCHER, 1887. 

 Ber. 20, 1328-1332 ; Jsb. Chem. 1887, 1461 ; Bull. Soc. chim. 48,747. 



Polycoumarins. 



By treating polj^hydric phenols with an excess of acetoacetic ester 

 and sulfuric acid, polycoumarins are formed. Di-methyl di-coumarin, 



C6H2< p. 11 ro ^ ^' ^^''"^^^^^^ from acetoacetic ester and resorcin, 



Ce H4 (0H)2, is a white powder almost insoluble in ordinary solvents, 

 soluble in alkalis from which solution acids precipitate di-methyl dicou- 



maric acid, C6H2< I qtt "^ ^ 2- Acetoacetic ester treated 



f CCTT CIT ^ 

 with phloroglucin gives trimethyl tricoumarin, C6< q p^ > 



which is also a powder difficultly soluble except in alkalis from which 

 solution the corresponding acid is obtained. These acids easily give 

 up water and are changed back into the lactones. 



DELISLE, A., 1887. 



Ber. 20, 2008; J. Chem. Soc. 52, 915 ; Jsb. Chem. 1887, 1719; 

 Bull. Soc. chim. 48, 659. 



Action of Sulfur Dichlorid on Acetoacetic Ester. 

 Preliminary Notice. 



By treating acetoacetic ester with sulfur dichlorid, hydrochloric acid 

 was given off and the mixture solidified. The new substance, 

 C10H14O6S, forms beautiful colorless crystals which are insoluble in 

 water but soluble in barium hydroxid, forming a barium salt. The 

 substance softens at 75° and melts at 90° to 91.° 



BENDER, Q., 1887. 

 Ber. 20, 2747-2752 ; J. Chem. Soc. 54» 53- 

 Action of Phenylhydrazin on Chloracetoacetic Ester. 



By this action a compound C12 H14 N2 O2 was formed, it is probable 

 that CH3C(N2HC6H5)CHC1C02R is first formed which changes 

 first into CH3CH(N2C6H5)CHC1C02R and then into CH3 C 

 (N2 Ce H5) : CHCO2 R which is /9-phenylazocrotonic ester, melting at 

 50. 5.° This can be reduced to phenylmethyl-pyrazolone. 



a-Naphthylamin and chloracetoacetic ester unite to form a compound 

 C,6 Hi6 NO2 CI, which melts at 75^ * 



