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Investigation of the colour reaction of phenols with the MBTH Reagent

Identification of organic compounds. Part LXXXVI

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Summary

The products of the colour reaction of a systematically selected series of phenols with the MBTH reagent have been investigated by means of spectrophotometric and chromatographic methods. 2,6-Dialkylphenols give red dyes formed by oxidative coupling in thep-position and 2,4-dialkylphenols violet colours due to reaction in theo-position. Phenols with a freep-position and at least one freeo-position give a mixture of the red and violet products. In the case of halogenated phenols dehalogenation occurs in both theo-andp-positions.

Zusammenfassung

Die Produkte der Farbreaktion einer Reihe von systematisch ausgewählten Phenolen mit 3-Methylbenzthiazolinon-2-hydrazon (MBTH) wurden spektrophotometrisch und chromatographisch untersucht. 2,6-Dialkylphenole geben rote Farbstoffe infolge der oxydativen Kupplung in derp-Stellung und 2,4-Dialkylphenole violette Färbungen, verursacht durch Reaktion in dero-Stellung. Phenole mit freierp-Stellung und mindestens einer freieno-Stellung geben Gemische aus rotenp- und violetteno-Produkten. Im Falle der Halogenphenole wurde Dehalogenierung in denp- sowieo-Stellungen beobachtet.

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Authors and Affiliations

  1. Faculty of Pharmacy, Charles University, Hradec Králové, Czechoslovakia

    J. Gasparič CSc. (Doz. Ing.), D. Svobodová & M. Pospíšilová

Authors
  1. J. Gasparič CSc.
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  2. D. Svobodová
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  3. M. Pospíšilová
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Gasparič, J., Svobodová, D. & Pospíšilová, M. Investigation of the colour reaction of phenols with the MBTH Reagent. Mikrochim Acta 67, 241–250 (1977). https://doi.org/10.1007/BF01213034

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  • DOI: https://doi.org/10.1007/BF01213034

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