m 



The Philippine Journal of Science 



1916 



appearing at the same concentration as in the case of the free 

 base. 



Attempts were made to prepare the diimidodihydrotereph- 



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Fig. 2. Curve 1. Diamidodiethylterephthalate in alcohol. Curve t. Diamidodiethyl- 

 terephthalate in alcohol plus 2 equivalents of hydrochloric acid. 



thalate by treating p-dioxyterephthalate with ammonium acetate 

 in the manner described for the preparation of the diimide of 

 ethylsuccinosuccinate,* but without success. 



•Baeyer, ibid. (1886), 19, 430. 



