ACETO ACETIC ESTER I09 



ZURCHER, H., 1889. 



Ann. Chem. 250, 281-294 ; J. Chem. Soc. 56, 725 ; Ber. 22, 258 (C). 



Action of Thiocyanates and Thiocarbamids on 

 Chlorinated Acetoacetic Esters. 



Methyl-oxythiazole-carboxylic ester, 



CO^CHsC — S, 



II I 



CH3 C COH 



\ ^ 



N 



is formed from monochlor-acetoacetic ester and a metallic thiocyanate. 

 Some of its reactions and derivatives are described. Thiocarbamid 

 acting on monochlor-acetoacetic ester gives amidomethyl-thiazole- 

 carboxylic ester, 



CO2 C. H5 — C — S 



II I 

 CH3 — C CNH2 



\ ^ 



N 



from which the free acid and some of its salts were obtained. Dichlor- 

 acetoacetic ester reacts with barium thiocyanate to form a compound 

 C14 H16O7N2S2 . With thiocarbamid dichlor-acetoacetic ester does 

 not react. 



FEIST, FRANZ, 1889. 

 Ber. 22, 1570-1571 ; J. Chem. Soc. 56, 957; Bull. Soc. chim. [313.657. 



Dehydracetic Acid. 



Dehj'dracetic acid when treated with hydriodic acid gives dimethyl- 



CTT • OrCTT ^ 

 pyrone, CO<pjj;p)pjj^( > O, which melts at 132°, boils at 248°-249° 



