408 



The Philippine Journal of Science 



1913 



2000 2.Z 



Oscillation frequency. 

 26 28 3000 32 34 



JS 



38 



4000 42 



k2 



4.0 



3.S 



3.4 



z « 



g 28 



zs 



Z.4 



T> 22 



20 



IS 



1.4 



sfji r 



ill 



Fig. 7. Curve 1. Nitrosophthalimidene in alcohol. Curve t. Nitrosophthalimidene 

 in alcohol + 1 equivalent of sodium ethoxide. 



BENZYLIDENE PHTHALIDE 



C= : CH'C6H5 

 CeH4\ .0 



Benzylidene phthalide was prepared from phthalic anhydride 

 and phenylacetic acid 5 and recrystallized from alcohol. The al- 

 cohol solution shows a faint blue fluorescence with the arc, and 



gives two absorption bands heading at j== 2960 and 3430 that 

 are separated by a very shallow transmitted portion (fig. 8) . 



' Ber. d. deutech. chem. Ges. (1885), 18, pt. 2, 3470. 



