122 BIBLIOGRAPHY OF 



acid Cg H IO O 3 , melts at 149, is soluble in alcohol, ether and chloroform 

 and decomposes at 160; its barium and silver salts were described. 

 Isodehydracetic ester is converted by warm anhydrous ammonia into 

 the corresponding lactam, identical with the substance obtained by 

 Collie by the condensation of /9-amido-crotonic ester. The change is 

 represented thus : 



CH 3 CH 3 



C C 



' ^ / ^ 



C0 2 C 2 H 5 C CH C0 2 C 2 H 5 C CH 



I I I 



CH 3 C CO CH 3 C CO 



\ / \ / 



O N 



H 

 Isodehydracetic ester Caroxethylmesitenlactam. 



Mesitene lactone 



C 



/ \ 

 HC CH 



I ! 



CH 3 C CO 



\ / , 

 O 



is changed by ammonia into mesitene lactam 



CH, 

 C 



/ \ 



HC CH 



I I 

 CH 3 C CO 



\ / 

 N 

 H 



An alcoholic ethereal solution of isodehydracetic ester treated in the 



