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.

    5/8 page 1430
    CLYIL—The Sulphonation of Glyoxalines. By Frank Lee Pyman and Leonard Allan Ravald. Direct sulphonation of glyoxalines has not been effected previously, but in two cases derivatives of g 1 y oxa 1 i ne- 2 -su I p h o ni c acid have: been prepared indirectly. Thus, Anschutz (Annalen, 1895, 284, 18) obtained 4 :5-diphenylglyoxaline^2-sulphonic acid by the oxidation of 2-thiol-4 :5-diphenylglyoxaline, whilst salts of caffeine-8-sulphonio
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