viii, a, 6 Pratt: Phthalides and Related Compounds 



409 



The solution in sulphuric acid is yellow, and possesses a beauti- 

 ful steel blue fluorescence, remarkably vivid under the influence 



Two well-marked bands at =■ = 2700 and 3660 were 



A 



of the arc 



observed in the absorption spectrum 



■i 2.8 



S 2.6 



24 



2.2 



£ 2.0 



1.8 



> 1.6 



1.4 



S 

 £ 



S 12 



to 



2* 



26 



28 



Oscillation frequency. 

 3000 32 34 3 6 



38 



4 000 42 



V 



11/. 













' I 



















1 





























































• 































































































N 

























Fig. 8. Curve 1. Benzylidene phthalide in alcohol. Curve 2. Benzylidene phthalide 



in sulphuric acid. 



CYANBENZYLIDENE PHTHALIDE 



C=C(CN)C«H 5 



C6 H4V .0 



c=o 



Cyanbenzylidene phthalide, prepared from benzyl cyanide and 

 phthalic anhydride, 6 was recrystallized from alcohol, glacial acetic 

 acid, and methyl alcohol after repeated boiling with bone black. 

 The very faintly colored yellow needles dissolve without apprecia- 



Ibid. (1885), 18, pt. 1, 1264. 



123668 3 



