l6 BIBLIOGRAPHY OF 



DEMARCAY, E., 1877. 



Compt. rend. 84, 554-556 and 1087-1089 ; J. Chem. Soc. 32, 590; 

 Ber. 10, 732 ; Jsb. Chem. 1877, 690. 



Simple Method of Preparing Certain Mono, Di, and Trichlor Acids. 



Phosphoric pentachlorid, acting on a compound of the formula CH3 

 CO CH X CO2 C2 H5, forms a substituted monochlor crotonic ester of the 

 formula CH, : C CI CH X CO2 C2 H5. In this manner the methyl, 

 ethyl, propyl, isopropyl and allyl crotonic monochlor esters were pre- 

 pared. Also some di-radical monochlor crotonic esters of the formula 

 CH2 : C CI C X Y CO2 C2 H5 both where X and Y were alkyl radicals 

 and where they were acid radicals. The ethyl-monochlor crotonic ester 

 and its isomer dimethyl-monochlor crotonic ester were prepared and 

 the differences between them noted. 



DEMARCAY, E., 1877. 



Compt. rend. 84, 1032-1033 ; J. Chem. Soc. 32, 594. 



Some Derivatives of Acetoacetic Ester. 



By treating ethyl- and methyl-acetoacetic esters each with a quan- 

 tity of bromin representing one molecule and saponifying the products, 

 two compounds of the composition 3 C5 He O2 + H2 O and 3 C4 H4 O2 

 -f- H2 O were obtained, which were named pentic and tctric acids re- 

 spectively. Just double the amovint of bromin being used, two acids 

 were formed each containing one atom of oxygen more. These were 

 U2im.^^ peiitenic and tctrenic. Mono- and di-brom-isopropyl acetoacetic 

 esters also gave rise to two acids, hexic, 3 Ce Hg O2 + H2 O, and hexcnic, 

 3 Ce, Hs O3 -F H2 O. 



SCHNAPP, HEINR., 1877. 

 Ber. 10, 1953-1954 and 2227 ; Ann. Chem. 201, 62-73; Jsb. Chem. 



1877, 718. 

 Di=ethyl=/9=oxybutyric Acid. 



Di-ethyl-acetoacetic ester when treated with sodium amalgam gives 

 diethyl-/9-oxy butyric acid CH3 CH (OH) C (C2 H5)2 CO2 H. By heat- 

 ing instead of forming the crotonic acid by splitting off water, it forms 

 acetic aldehyde and di-ethyl-acetic acid. The latter boils at 195° to 

 197° and has a specific gravity of .945. 



