410 



The Philippine Journal of Science 



1913 



ble color in alcohol. This solution shows a peculiar absorption 

 spectrum containing a small band heading at - = 2960 and two 



A 



step-off s (fig. 9). 



The sulphuric acid solution is canary yellow to orange, and 

 shows a greenish fluorescence with the arc. It gives a well- 

 marked band at - = 2800 and a small band at - = 3820. 



A A 



24 



26 



2fl 



Oscillation frequency. 

 3000 32 34 36 



38 



4000 42 



s 2.8 



m 



U 



a 



1 26 



O 



o 

 o 



S Z.4 



•H 



I 22 



"8 

 B 



1 2." 



.£ 



GO 



I 1.8 



M 



'£ 



1 1.6 



I 



"3 



U 



CO 



g 

 ■a /.2 



12. 





/. 



















































• 













































































































X 



























































Fig. 9. Curve 1. Cyanbenzylidene phthalide in alcohol. Curve 2. Cyanbenzylidene 

 phthalide in sulphuric acid. 



PHTHALYLACETIC ACID 



C=CHCOOH 



c=o 



C 6 H 4 C )0 



Phthalylacetic acid, made from phthalic anhydride and acetic 

 anhydride, 7 was repeatedly recrystallized from glacial acetic acid 



'Ibid. (1893), 26, pt. 1, 952. 



