I 1 8 BIBLIOGRAPHY OF 



which melts at 201. "-202? By the action of water on dibrom-methyl- 

 acetoacetic ester in presence of barium chlorid hydroxytetric ester, 

 C 5 H 5 (C 2 H 5 ) O 4 , is obtained, it melts at 67-68 and has an acid re- 

 action. By treating an alcoholic solution of hydroxytetric acid with 

 gaseous hydrochloric acid a body boiling at 224-226 and having the 

 composition of hydroxytetric diethyl ester is obtained. 



CLOEZ, C., 1890. 



Bull. Soc. chim. [3] 3 602-605 ; Ber. 23, 435 (C). 

 Identity of Hydroxytetric and Mesaconic Acids. 



The author proves the identity of these acids by their melting points, 

 solubility in water, volatilization, brown color given with ferric chlorid 

 and the same reactions towards bromin and acetyl chlorid. 



HALLER, A. AND A. HELD, 1890. 



Compt. rend. HI, 647-650 ; J. Chem. Soc. 60, 171. 

 f-Cyanacetoacetic Esters and their Chlor-imido Derivatives. 



f-Cyanacetoacetic ester boils at 135 to 138, at 40 to 45 m.m. pres- 

 sure, with some decomposition. Treated with hydrochloric acid in 

 alcoholic solution the hydrochlorid of the imido ester of acetone-dicar- 

 boxylic ester, QH 2 (CO 2 C 2 H 5 ) COCH 2 C(OC 2 H 5 ) (NH),HC1, is formed 

 which is very unstable being decomposed by water. f-Cyanacetoacetic 

 methyl ester boils at 217 to 218 and when treated with hydrochloric 

 acid in methyl alcohol it yields the hydrochlorid of the imido ester of 

 acetondicarboxylic methyl ester + one molecule of HC1 which is either 

 CH 2 (CO 2 CH 3 )CH(OH)CHC1C(OCH 3 )(NH),HC1 or CHC1(CO 2 CH 3 ) 

 CH(OH)CH 2 C(OCH 3 )(NH),HC1. 



