/-OXYCAEBOSTYKIL FKOM 0-NlTEOBENZOYLACETIC ACID. d 



it dissolves slightly, its melting point was found to be 122°. 

 Needham and Peekin give 117°-120° as its melting point. 



Ferrous sulphate (8 grams) was dissolved in water (20 c.c.) 

 and an excess of ammonia was added to it. o-Nitrobenzoylacetic 

 acid (1 gram) dissolved in ammonia was then added. The reaction 

 took place at once in the cold, the greenish coloured ferrous 

 hydroxide changing into the reddish coloured ferric hydroxide, 

 which was filtered off. On neutralising the filtrate with hydro- 

 chloric acid, a colourless precipitate separated out, which was 

 collected on a filter and drained on a porous porcelain plate. 

 This precipitate does not dissolve in most of the ordinary organic 

 solvents. It can be dissolved in a solution of sodium carbonate 

 and is reprecipitated from this solution on acidification. It does 

 not melt at 300"^. All these properties correspond to those of 

 j'-oxycarbostyril or 2 : 4-dihydroxyquinoline, whicli is the inner 

 anhydride of o-aminobenzoylacetic acid, the reduction-product. 



A sample recrystallised from glacial acetic acid gave the 

 following percentage of nitrogen on analysis : 



0.1663 gr. substance gave 12.2 c.c. nitrogen at 



16° and 750.6 m.m N = 8.44?^, 



C9HAN requires X = 8.70?^. 



