X. A, 1 



Gibbs and Brill: Diethylsuccinosuccinate 



57 



The great difference in the curve of the acetyl derivative from 

 those of the first two compounds, shows that the fixation of the 

 labile hydrogen atom has the same general effect as in ethylsuc- 

 cinosuccinate and its diacetyl derivative. In the latter the 

 spectrum shows only general absorption since the benzene ring 



40 

 3.8 

 3.S 

 Si 

 iZ 

 JO 

 IB 

 LB 

 ZA 

 Z2 



to 



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 IS 

 14 

 I.Z 



Fig 2. 



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 5 





2000 21 ^« 



Oscillation frequency. 

 26 23 3000 32 3* 36 



38 *000 *i 



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Cwnie I. P-diimide of diethylsuccinosuccinate in alcohol. Cv.rve II. P-diiraidc of diethyl- 

 succinosuccinate in alcohol plus 2 equivalents of hydrochloric acid. 



is more nearly saturated. The entire disappearance of an ab- 

 sorption band in acetylmethylsalicylate is not to be expected 

 since phthalic acid " and phthalic anhydride show a similar ab- 

 sorption band due to the effect of the vibration of the benzene 

 ring. 



Pratt, This Journal, Sec. A (1913), 8, 399. 



