ACETO ACETIC ESTER IIJ 



BUCKA, K. AND CH. SPRAGUE, 1890. 



Ber. 23, 847-855 ; J. Chem. Soc 58* 796. 

 Action of Phenylhydrazin on Thioacetoacetic Ester. 



When these substances react in cold, glacial acetic acid in the pro- 

 portion of one molecule of thioacetoacetic ester to two molecules of 

 phenylhydrazin they form thiophenylmethylpyrazolone, 



CH3 



and not C20 H22 N4S04.as Michaelis and Philips state in their article 

 (*vvhich see). It decomposes at 183° without melting, is soluble in 

 alkalis and forms stable salts with strong acids. When heated with 

 an excess of phenylhydrazin it goes over into phenylmethylpyrazolone- 

 ketophenylhydrazone which is the same as Michaelis' phenyl-meth)'!- 

 pyrazolonazobenzene, 



C6H5 



N 

 / \ 



N CO 



II I 

 CH3C - C = N — N — H — C6H5 



CLOEZ, C, 1890. 



Compt, rend, no, 583-586 ; J. Chem. Soc. 58, 739 ; Ber. 23, 284 (C). 



Hydroxytetric Acid. 



By treating methyl-acetoacetic ester with bromin dibrom-methyl- 

 acetoacetic ester, Ce H7 Bra (CH3) O3 , is formed, and when this is 

 treated with alcoholic potash, hydroxytetric acid, C5 He O4 , is obtained, 



*See page 116. 



