ACETO ACETIC ESTER 129 



obtained from bromacetoacetic ester and thiocarbamid melts at 94 , the 

 free acid melts at 130. Thiacetamidoacetic ester, CH 2 (SCNHCH 3 ) 

 COCH 2 CO 2 C 2 H 5 , is formed besides //-methyl-thiazylacetic ester from 

 bromacetoacetic ester and thiacetamid in alcoholic solution. Methyl- 

 thiazylacetic ester, 



S - CH 



I > CCH 2 CO 2 R 



C(CH 3 ):N 



boils at 238 to 240^ r-Thiacetoacetoacetic ester, CH 2 (SCOCH 3 ) CO 

 CH 2 CO 2 R , results when thiacetamidacetoacetic ester hydrobromid is 

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



_ ^s v 

 pound, probably of the formula CO 2 RCH 2 C CCH2 C 2 R ' 



was also described. 



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



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



Decomposition of Acetone-dicar boxy lie Ester. 



When acetone-dicarboxylic ester, CO 2 C 2 H 5 CH 2 COCH 2 CO 2 C 2 H 5 , 

 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 /3-Ketonic Esters. 



Guanidin carbonate and acetoacetic ester condense to form imido- 



methyl-uracyl, CH xCCCH )NH ^ C : NH ' which melts with decom - 

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



Dibromohydroxyimidomethyl-uracyl, NH < > CCH3 OH ' 



is formed together with bromimidomethyluracyl, C 5 H 6 BrN 3 O , when 

 imidomethyl-uracyl is heated with bromin ; it melts at 160" When 



