ACETO ACETIC ESTER 129 



obtained from bromacetoacetic ester and thiocarbamid melts at 94 , the 

 free acid melts at 130° Thiacetamidoacetic ester, CHjCSCNHCHj) 

 COCH2 CO2 C2 H5 , is formed besides //-methyl-thiazylacetic ester from 

 bromacetoacetic ester and thiacetamid in alcoholic solution. Methyl- 

 thiazylacetic ester, 



S CH 



I > CCH2 CO2 R 



C(CH3):N 



boils at 238° to 240 ^--Thiacetoacetoacetic ester, CH^ (SCOCH3) CO 

 CH2 CO2 R , results when thiacetamidacetoacetic ester hydrobromid is 

 warmed with water. It boils at 155° at 15 ni. m. pressure. A com- 

 pound, probably of the formula CO2 RCH2 C ^^(^^ ^/ CCH2 CO2 R , 

 was also described. 



PECHMANN, H. v. AND M. DUNSCHMANN, 1891. 



Ann. Chem. 261, 162-166 ; J. Chem. Soc. 60, 672. 



Decomposition of Acetone=dicarboxyIic Ester. 



When acetone-dicarboxyhc ester, CO2 C2 H5 CH2 COCH2 CO2 C2 H5 , 

 is changed to the potassium salt and then boiled with water, acetoacetic 

 ester is produced which is identified by being treated with phenylhy- 

 drazin and changed into methyl-phenylpyrazolone. 



JAEGER, J., 1891. 



Ann. Chem. 262, 365-372 ; J. Chem. Soc. 60, 1007. 



Condensation of Guanidin with ^-Ketonic Esters. 



Guanidin carbonate and acetoacetic ester condense to form imido- 



methyl-uracyl, CH ^0^0^ )NH ^ ^ * ^^ ' '^^^^^ °^^^^^ '^^^^ decom- 

 position at 270" The hydrochlorid, nitrate and sulfate were described. 

 Dibromohydroxyimidomethyl-uracyl, NH <pQp (-o^ \ > CCH3 OH , 



is formed together with bromimidomethyluracyl, C5 He Br N3O , when 

 imidomethyl-uracyl is heated with bromin ; it melts at i6or When 



