24 BIBLIOGRAPHY OF 



and carbon dioxid. Carbopyrotritartaric acid fused with potassium 

 hydroxid gives succinic and acetic acids. The formula assigned to 

 carbopyrotritartaric acid is CH3 CO CH CO2 H 



CH-C=C=H2 



CO — O, and the one assigned to 

 pyrotritartaric acid is CH^ 

 CO 



CH-CH = C=CH3 

 CO. H 



ZUBLIN, J., 1878. 



Ber. II, 1 41 7- 1420; J. Chem. Soc. 34. S79 ; Jsb. Chem. 1878, 811. 



Azobenzene=acetoacetic Acid. 



This name is proposed for what V. Meyer calls Azo-phenylacetoacetic 

 acid* (Ber. 10, 2075.) CH, 



CO 



CH-N=N-C6 H5 



CO2 H. The potassium, barium, ledd, silver and 

 copper salts and ethyl ester are described and also paraazotoluol-aceto- 

 acetic acid, CH3 CO CH (N. Cg H4 CH,) CO, H. and its ethyl ester. 



*See page 17. 



BANDROWSKI, E., 1879. 



Ber. 12, 344-346 ; J. Chem. Soc. 36, 523 ; Jsb. Chem. 1879, 628. 

 Behavior of Dibromsuccinic Acid with Water. 



At high temperatures water decomposes dibromsuccinic acid by 

 abstracting hydrobromic acid. Two acids are left, one with a boiling 

 point between 129° and 130° which is l)romomaleic acid, the other one 

 boils at 172! 



HILQER, A., 1879. 



Ann. Chem. I95» 314-317 ; Ber. 12, 664 ; J. Chem. 'Soc. 36, 560 ; Jsb. 



Chem. 1S79, loSi. 

 Detection of Acetoacetic Ester in Urine. 



Acetoacetic ester was found in the urine of diabetic patients to the 

 amount of .0399 to .1909 in 100 parts. 



