ACETO ACETIC ESTER I}} 



WALDEN, P., 1891. 



Ber. 24, 2025-2039; J. Chem. Soc. 60, 1187. 

 Tetric and Oxytetric Acids and their Homologues. 



Experiments were performed attempting to determine whether tetric 

 acid and its homologues contain the carboxylic group but no definite 

 conclusions were reached. Oxytetric acid and its homologues were 

 shown to be alkyl substituted fumaric acids, thus oxytetric is mesaconic 

 or methyl fumaric, oxypentic is ethyl fumaric. etc. The acids described 

 by Demarcay as hydroxy tetric, etc., are identical with alkyl succinic 

 acids, hydroxytetric is methyl succinic and hydroxypentic is ethyl 

 succinic, etc. The acids are all obtained from the bromated alkyl ace to- 

 acetic esters. 



SPRAQUE, CHARLES T., 1891. 



J. Chem. Soc. 59* 329-343. 

 Thiacetoacetic Ester. 



This substance was produced and after carefully determining the 

 melting point it was found to be between 75 and 78. By the action of 

 phenylhydrazin four bodies were produced : (i) thiophenyl-methyl- 

 pyrazolone ; (2) Knorr's phenylmethyl-pyrazolone-azobenzene ; (3) a 

 substance, C IO H 9 * N 2 SO ; (4) Knorr's bisphenyl-methyl-pyrazolone. 

 The first one is 



NC 6 H 5 NC 6 H 5 



/\ / \ 



N CO OC N 



II I I II 

 CH 3 C CH S HC CCH 3 



it is a weak base; dissolves in alkalis and weak acids reprecipitate it. 

 If it be heated with phenylhydrazin the other three above mentioned 

 compounds are produced. To the third product the author gave the 

 formula C IO H 8 * N 2 SO, but states that Holtzcka has since proven it to 

 be bisulphid of phenylmethyl pyrazolone (C IO H 9 N 2 O) 2 S 2 . A method 

 was given for preparing a good yield of each one of the four products. 



* A disagreement, Cio Hs N 2 SO is probably correct 



