ON A DIHYDRO-QUINOXALINE 1 33 



zoyl chloride. The substance has no definite melting-point. At 85°-90° 

 it begins to grow soft; this continues to 175 , where the compound 

 decomposes. 



NITROGEN DETERMINATION 



0.2096 g. substance gave 15.2 c.c. N. at a temperature of 24. 9 and a 

 pressure of 614.3 mm - 



C I2 H I4 N 2 . 2 C 6 H 5 CO 



Computed Found 



N=7.o7 per cent. N=6«7i per cent. 



C I2 H IS N 2 - C 6 H s CO would require 9.59 per cent, nitrogen. 



Since this paper was written, the authors have found that it is much 

 easier to prepare the base by heating a benzene solution in molecular 

 proportions of orthophenylene- diamine and mesityloxide for several 

 hours upon the water bath. On cooling, the base crystallizes out. 



