ACETO ACETIC ESTER 71 



product of reaction between methyl-amin and acetoacetic ester, it 

 follows that nitrogen must be present as an imido group which gives 

 for the nucleus formula : 



H 

 C 



/ \ 

 C C 

 I I 

 C C 



\ / 



N 

 H 



Benzylidin-diacetoacetic ester, C 6 H 5 CH (C 6 H 9 O 3 ) 2 , melting at 152- 

 153 and dehydrobenzylidin diacetoacetic ester, 



C CH 3 : C CO 2 C 2 H 5 



o 3 2 



^ CCH 3 : C CO 2 C 2 H 5 



melting at 87-88 were formed from acetoacetic ester and benzal- 

 dehyde but the presence of some primary amin is necessary. 



JAKSCH, R. v., 1885. 



Ber. 19, 781 (C). 

 Acetonurea and Diaceturea. 



The author states that acetoacetic acid is not found in normal urine 

 and as an explanation of its origin in diseased urine he supposes that 

 it came from acetone by the taking up of oxygen, uniting with formic 

 acid and then splitting off water. 



PERKIN, Jr., W. H., 1885. 



J. Chem. Soc. 47. 801-855. 



Synthetical Formation of Closed Carbon Chains. 



On pages 834-835 of this long article, the author shows the many 

 differences in behavior between acetyl tri-methylene carboxylic ester, 



