o- and p-Toluenazoglyoxalines / by Frank Lee Pyman and Leonard Allan Ravald.

  • Pyman, Frank Lee.
Date:
[1920?]
Catalogue details

Licence: In copyright

Credit: o- and p-Toluenazoglyoxalines / by Frank Lee Pyman and Leonard Allan Ravald. Source: Wellcome Collection.

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    entirely molten at 307° (corr.). It. is soluble in about 5 parts of cold or 2 parts of bob water, but is almost insoluble in alcohol. (Found, C = 24*2 ; H = 2*6; N = 18*9. C3H40oN9S requires C = 24*3; H = 2*7; N = 18*9 per cent,) Glyoxalinesulphonic acid is strongly acid to litmus, whilst its salts are only faintly alkaline. It. does not combine with strong aqueous acids. On adding sodium diazobenzeiie-p-sulphonate to glyoxaline- sulphopic acid in excess of aqueous sodium carbonate, no immediate coloration is produced, but a deep red colour develops in the course of a few minutes. In the presence of sodium hydroxide the solu¬ tion remains pale yellow even on keeping. An attempt to nitrate glyoxalinesulphonic acid by boiling 1*1 grams with a mixture of 1 c.c. of fuming nitric acid and 1 c.c. of sulphuric acid was un¬ successful, the glyoxalinesulphonic acid being recovered unchanged. The barium salt crystallises from water in colourless octahedra, which are anhydrous, soluble in 3 parts of hot water, and little less soluble in cold water, but insoluble in alcohol. (Found: Ba = 34‘2. (C3H303N2S)2Ba requires Ba, = 34*l per cent,) The sodium salt, crystallises from water in large, colourless tablets, which contain 2H20. It is very readily soluble in water, but almost insoluble in alcohol. (Found, in air-dried salt: Na=ll‘2; H20 = 17*7. C3H303N9SNa,2H90 requires Na=ll-2; H20 = 17*5 per cent.) The ammonium salt crystallises from water in large, colourless prisms. It is very readily soluble in water, and easily so in hot moist, alcohol, but. almost insoluble in absolute alcohol. It loses ammonia at temperatures above 100°, leaving the free acid. The air-dried salt lost 1*5 per cent, of water in a. vacuum over sulphuria acid. (Found, in salt dried in a vacuum: N = 25*4; loss at 120° = 10*5. C3H303N2S*NH4 requires N = 25*4; loss of NH3=:10'3 per cent.) We desire to thank the Salters’ Institute of Industrial Chemistry for the grant of a fellowship which has enabled one of us (L. A. B.) to take part in the investigation. Municipal, College op Technology, The University of Manchester. [Received, October 16th, 1920.] PRINTED IN GREAT BRITAIN BY R. CLAY AND SONS, LTD.,