ACETO ACETIC ESTER IO5 



HALLER, A. AND A. HELD, 1889. 



Compt. rend. 108, 516-518 ; J. Chem. Soc. 56, 588 ; Ber. 22, 255 (C). 



Monochlor-acetoacetic Esters. 



Two monochlor derivatives of acetoacetic ester were formed, the a, 

 and the y. The latter by passing chlorin into acetoacetic ester at low 

 temperatures. It boils at 1 88°- 189.° It can be distinguished from the 

 « product by the fact that the latter readily forms an insoluble cyanid 

 with potassium cyanid. 



HELD, A., 1889. 



Bull. Soc. chim. [3] i, 306-311 ; Ber. 22, 407 (C) ; J. Chem. 



Soc. 56, 1 141. 



Derivatives of Cyanacetoacetic Ester. 



Bromin reacts with cyanacetoacetic ester to form a dibrom derivative, 

 CH2 BrCOCBr (CN) CO2 C^ H5 , a yellowish red liquid which decom- 

 poses upon being distilled even under reduced pressure. Chlorin forms 

 with cyanacetoacetic ester C(, Hy (CN) CI2 O3 , which boils at 90° to 105° 

 with 20 to 25 m. m. pressure and decomposes spontaneously. Ethyl- 

 cyanacetoacetic ester CH3 COC (C2 H5) (CN) CO2 C2 H5 , prepared from 

 ethyl-sodacetoacetic ester and cyanogen chlorid, boils at 103° to 105° at 

 25 m. m. pressure. Potassium hydroxid decomposes it into acetic and 

 butyric acids. Methyl-cyanacetoacetic ester prepared similarly boils at 

 90° to 92° at 20 jjx. m. pressure. Potassium hydroxid decomposes it into 

 acetic and propionic acids. Unsuccessful attempts were made to pre- 

 pare cyanacetoacetic acid. 



CURTIUS, TH. AND R. JAY, 1889. 



J. prakt. Chem. [2] 39. 27-58 ; Ber. 22, 134 (C); J. Chem. Soc. 56. 393- 



Hydrazin. 



On pages 51 and 52 of this article the reaction between acetoacetic 

 ester and hydrazin hydrate, N2 H4, H2 O, is treated of. Methyl pyra- 



H2C-CO 

 zolone, I >NH, is formed which is a crystalline substance 



CH3C=N 

 melting at 215°, which will dissolve in both acids and alkalis. 



