In the first paper of this series it was shown that the compound synthesized by Conrad and Zart and called 1-phenyl-3-hydroxy-5-pyrazoloinmeide is in fact the isomeric l-phenyl-3-amino-5-pyrazlone I. The real l-phenyl-3-hydroxy-5-pyrazolone imide I1 has now been prepared. Phenylhydrazine was condensed with cyanoacetyl chloride to give 0-cyanoacetylphenylhydrazine 111. In- stead of the acid chloride, cyanoacetazide3can be used, giving a somewhat higher yield. I11 is a colorless well-crystallizing substance.
