DIETHYLSUCCINOSUCCINATE: II 



A STUDY OF THE ABSORPTION SPECTRA OF SOME DERIVATIVES* 



By Harvey C. Brill 



(From the Laboratory of Organic Chemistry, Bureau of Science, 



Manila, P. I.) 



FOUR TEXT FIGURES 



In a recent article by Gibbs and Brill ^ a study of the absorp- 

 tion spectra of diethylsuccinosuccinate and some derivatives was 

 presented. It was shown that ethylsuccinosuccinate exists in the 

 enol and keto forms with slightly different solubilities, thus 

 allowing the separation of the one modification in partial freedom 

 from the other ; that the selective absorption of these compounds 

 was due to the joint influence of the carbonyl and carboxyl 

 groups; that the substitution of an acetyl group for the enol 

 hydrogen destroys selective absorption in the case of succino- 

 succinate, but not in the case of salicylic acid ; and the prediction 

 was made that diketohexamethylene would show selective 

 absorption. 



In order to add evidence to these conclusions, some additional 

 compounds have been prepared and examined under the iron- 

 nickel arc. 



p-DIOXYTEREPHTHALIC ESTER 



H COOC2H5 



H-A=0 



or 



0=1 j-H 



X 



H COOC2H5 



This compound, which was mentioned by Geuther,' and proved 

 to be the compound represented by the above formula by the 

 investigation of Ebert,* was prepared by treating ethylsuccino- 

 succinate dissolved in carbon disulphide with bromine according 



'Received for publication April 6, 1915. 

 *This Journal, Sec. A (1915), 10, 51. 

 'Ann. d. Chem. (1883), 219, 125. 

 *Ibid. (1885), 229, 45. 



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