ACETO ACETIC ESTER 8 1 



is insoluble in water, soluble in ether, benzene and chloroform and 

 gives a red color with concentrated sulfuric acid. When heated with 

 an alkali it is decomposed into phenyl mercaptan and /9-thio-phenyl- 

 crotonic acid, CH 3 (SC 6 H 5 ) : CHCO 2 H, which melts at i76-i77, 

 is insoluble in water, soluble in benzene and hot alcohol. When 

 heated this decomposes, giving thio-phenyl-propylene, C 3 H 5 SCe H 5 , 

 which boils at 2o6-2io and gives a blue color with sulfuric acid, 

 which turns violet upon being heated. 



LIST, R., 1886. 



Ann. Chem. 236, 1-32 ; J. Chem. Soc. 52, 127 ; Ber. 19, 825 (C) ; 

 Jsb. Chem. 1886, 564 ; Bull. Soc. chim. 47 587. 



Action of Thiocarbamid on Acetoacetic Ester. 



Thiomethyl-uracyl is formed, thus : CH 3 COCH 2 CO 2 C 2 H 5 + NH 2 

 CSNH 2 = CH 3 C (OH) CH 2 CO 2 C 2 H 5 



NH C = S NH 2 and then water and alcohol 

 breaking off it leaves CH 3 C : CHC : O 



I *s 



NH C=S N H. 



The silver, copper, mercury, potassium, and sodium salts and the 

 methyl and ethyl esters were produced and described. The sulfur can 

 be removed from the thiomethyl-uracyl by bromin or by silver or 

 mercuric oxid. Thiomethyl-uracyl acetic acid, C 7 H 8 N 2 SO 3 , and its 

 ethyl ester were made by using monochlor-acetic ester. 



In the formation of the esters an intermolecular change is supposed 



to take place and the formulae are written CH 3 C : CH C : O 



I I 



N : C - N H 



S R. 



