134 BIBLIOGRAPHY OF 



COLLIE, J. NORMAN, 1891. 



J. Chem. Soc. 59, 617-621. 

 Some Reactions of Dehydracetic Acid. 



In the preparation of dehydracetic acid by passing acetoacetic ester 

 through a red-hot iron tube, there were formed, besides the dehydra- 

 cetic acid, acetone, alcohol, carbon dioxid, ethylene and a residue. 

 Acetoacetic methyl ester similarly treated gave large quantities of 

 dehydracetic acid, but ethylacetoacetic ester gave none at all. De- 

 hydracetic acid is slightly decomposed by water into carbon dioxid and 

 dimethylpyrone. When boiled with hydrochloric acid it is totally 

 decomposed into carbon dioxid and a compound, C;!!!^^!, which 

 melts at 83 -85 and is acid in water solution. Barium and copper 

 salts of dehydracetic acid were prepared, the former corresponded most 

 nearly with (CsH 9 O 5 ) 2 Ba and was considered to be the salt of 

 tetracetic acid, CH 3 COCH 2 COCH 2 COCH 2 CO 2 H; and the latter 

 corresponded to C 24 H 25 O 9 N 3 Cu, being formed by ammonia and copper 

 acetate. Hydrocyanic acid has no action on dehydracetic acid. 



BIGINELLI, P., 1891. 



Ber. 24, 2962-2967; J. Chem. Soc. 62, 56. 

 Aldehydeuramids of Acetoacetic Ester. Part II. 



In the continuation of the subject it is found that two isomers, cor- 

 responding to the two formulae given in the first article on this subject,* 

 are always produced. The compounds 



CH 3 



C, 4 H I6 N 2 4 ;-C : N. CO. N. CH C 6 H 4 OH 

 I 



CH 2 



C0 2 C 2 H 5 

 CH 3 

 and C NH CO-N CH C 6 H 4 OH 



II 



CH 



C0 2 C 2 H 5 



formed from carbamid, salicylaldehyde and acetoacetic ester, and the 

 similar compounds, Ci 7 H 22 N 2 O 3 , formed from cumaldehyde, CeH 4 

 (C 3 H 7 ) COH, carbamid and acetoacetic ester ; C l6 H l8 N 2 O 3 , obtained 

 by using cinnamaldehyde, and C I2 H I4 N 2 O 4 , obtained by using 

 furfural dehyde, are produced and described. 



* See page 130. 



