XI, A, 2 



Brill: Diethylsuccinosuccinate, II 



61 



P-diamidoterephthalic ester was prepared by the method of 

 Baeyer." The compound dissolved in alcohol gave a reddish 

 yellow solution which fluoresced bluish green^ in the light of the 

 arc. The band appears in the visible region at 1/a.=2,310, with 



2000 ZZ 2* 



ZS 



Oscillation frequency. 

 28 3000 32 3^ 36 



30 



4000 «2 





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3.8 

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 1.6 

 /.* 

 I.Z 



Fig. 1. Curve 1. Dioxydiethylterephthalate in alcohol. Curve i. Dioxydiethyltere- 

 phthalate in alcohol, plus 2 equivalents of sodium alcoholate. Curve S. Diacetyl 

 of dioxydiethylterephthalate in alcohol. 



a great increase in the general absorption in the ultra-violet 

 region from 1A=3,500 to 1/A=4,200. By adding an excess of 

 hydrochloric acid, the solution became almost colorless, fluores- 

 cence was still visible in the light of the arc although less 

 pronounced, and the band was shifted outside the visible region, 



*Ber. d. deutsch. chem. Ges. (1886), 19, 430. 



