VIII, A, 3 



Pratt and Gibbs: Two Phthaloximes 



187 



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Fig. 6. Full curve = phthalhydroxamic acid. 



Dash curve = phthalyl phenyl hydrazine. 

 Dot curve = anilidophthalamic acid. 



Description of fig. 6. — The absorption spectrum of phthal- 

 hydroxamic acid shows a small band in the ultra-violet heading 



at j- = 3560 and indications of benzene bands. This is evi- 

 dence that the condition present in oxime, phthalic acid, phthal- 

 imide, etc., is still present, although the persistence of the 

 characteristic band is greatly decreased in the case of the 

 hydroxamic acid. The spectroscopic behavior of phthalhydrox- 

 amic acid, therefore, corresponds with the formula generally 

 assigned to this compound. 



