Application of Ultraviolet Spectroscopy to Studies on Hydroxymethylation Reaction of Melamine

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Other Title
  • 紫外吸収スペクトルによるメラミンのヒドロキシメチル化反応の研究
  • 紫外吸収スペクトルによるメラミンのヒドロキシメチル化反応

Abstract

The absorption maxima of (hydroxymethyl) melamines were found to shift to longer wavelength as the number of the hydroxymethyl groups increased. The hydroxymethylation reaction of melamine was monitored by this absorption maximum. A method of determin ing molecular, species distribution in (hydroxymethyl) melamine has been devised by a combination of this phenomena and ion exchange chromatography. The hydroxymethylation r eaction of melamine was found to follow reversible second order kinetics. The equilibrium constant K was estimated to be 2.7-3.5 in a dilute solution (about 1/30 mol/l) and this small value showed that the reversible reaction was not negligible. The activation energy was evaluated to be 25.0-45.4 kcal/mol. Dehydroxymethylation reaction of (hydroxymethyl) melamine obeyed i r reversible first order kinetics and the activation energy was evaluated to be 25.0-25.4kcal/mol. This value was almost independent of the number of substituted hydroxymethyl g r oups and the pH value of the solution. The obtained molecular species distribution was qualitative l y the same as the one estimated from paper chromatography and chemical analysis, supporting the validity of this method.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1982 (1), 125-130, 1982-01-10

    The Chemical Society of Japan

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