Abstract
Abstract Some crosslinked chelating resins were prepared and the catalytic activity of the resin-rnetal chelates for the oxidation; of 2,6-dihydroxyphenylacetic acid(homogentisic acid) and hydroquinone was investigated. The resin–Cu(II), resin–Au(III), and resin–Ag(I) chelates had a high catalytic activity. Especially resin–Cu(II) chelate had the highest catalytic activity for these oxidation reactions, and its activity did not decrease even after repeated use. The chelating resins having hydrazide or polyethylenepolyamine side chains had a high catalytic activity. In order to have a high catalytic activity, the resin–metal chelates must leave coordination places open for the substrate to coordinate to metal in the chelates. In the oxidation of homogentisic acid, the catalytic activity of gel type resin increased with the increase of crosslinking degree in the range from 0.5% to 7.5%. However, the catalytic activity of the macroreticular chelating reins was scarcely affected by the degree of crosslinking. The oxidation reaction of homogentisic acid showed a kinetic behavior of a typical Michaelis-Menten type.
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