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Derivatives of salicylic acid.—Part IX

Stability of the sulphonic acid group in the 4-sulphosalicylic acid. Part I. Nitration of 4-sulphosalicylic acid


It is shown that the sulphonic acid group outside the directing influences of the -OH and -COOH groups cannot be subtituted by the nitro group as in 3-, or 5-sulphosalicylic acids.

Thus on nitration of 4-sulphosalicylic acid, (I) 4-sulpho-5-nitro-salicylic acid, (II) 4-sulpho-3:5-dinitrosalicylic acid, and (III) 2:4:6-trinitrophenol-m-sulphonic acid were obtained.

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Communicated by Dr. T. S. Wheeler, Ph.D., F.I.C., F.Inst.P., M.I.Chem.E.

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Hirwe, N.W., Jambhekar, M.R. Derivatives of salicylic acid.—Part IX. Proc. Indian Acad. Sci. (Math. Sci.) 3, 236–239 (1936).

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  • Salicylic Acid
  • Nitro Group
  • Mother Liquor
  • Sulphonic Acid Group
  • Barium Carbonate