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Investigation of Regularities and Products of Oxidative Polycondensation of 1,3-Benzenediol

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410

10

In the presence of H202, H202 + Fe^3+, NaOel, OH + 02 oxidants, 1,3-benzenediol (80) enters into reaction of oxidative polycondensation and forms the oligomer product, including dihydrooxyphenylene links. The kinetic regularities of 80 oxidative polycondensation with oxygen in the alkaline medium have been studied by volumetric and EPR methods. It has been established that the reaction follows a first order both in monomer and alkali. In the reaction course the quintiplet EPR signals have been registered, each line of which is faintly split into a triplet, that has been assigned to the dimeric radical. It has been established that BO oligomer oxidation with oxygen in the alkaline medium proceeds without an induction period and has a first order in relation to the concentration of dihydroxy- oxyphenylene-linked anions. At the same time, the accumulation of relatively stable macroaroxylic radicals has been observed. The mechanism of 1,3-BO oxidative polycondensation has been suggested, lncludinq the stages of single-electron oxidation of SO anion into oxyphenoxyl radicals and recombination of their resonance forms.

1199418