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At present, oxidative polymerization is the commercial means of obtaining polyesters [I 10, 1 111. Since it has been known that copper complexes of amines can catalyze the oxidative coupling of disubstituted 2,6-phenols [ 1121, many research projects have tackled the problem of elucidating the kinetics and mechanism of the given reaction [113- 1161. A significant contribution to the study of this process has been made by the pioneer research of ChaNa [117- 1221 and Tsuchida [66,67]. Depending on the reaction conditions, the oxidative coupling leads to formation of a C - 0 or C-C bond: H GCH3 CH3 This results in the formation of polyphenylene oxide (PPO) or diphenoquinone (4-(3,5-dimethyl-4-oxo-2,5-cyclohexadiene1-ilidene-2,6-dimethyl-2,5-cyclohexadieneI-one).

04 Polyvinylimidazole-Fe(II1) Tyrosinase Rate-determining step DOPA DOPA, DOPAChromium During the oxidation of DOPA by imidazole-copper(I1) complexes, a stable intermediate with A, = 480 nm attributed to DOPA-chromium is formed. Catalysis by vinylimidazole-vinylpyrrolidone-copper(I1) complexes is most related to that of t yrosinase. Catalytic properties of copper complexes with monomer, oligomer and polymer ligands containg f NCXNPh ( X = 0,S) fragments have been observed during DMP oxidation at room temperature in benzene-methanol (65 :35 vol/vol) and benzene-methanol-DMSO (64 : 35 : 1 vol/vol) solvent mixtures.

Yaroslavsky, J. Am. Chem. G. Overberger, Y. Okamoto, Macromolecules 5, 363 (1972) [25] N. N. G. Overberger, M. Morimoto, J. Am. Chem. -P. Couvercelle, Y. Huguet, M. C. J. S. Salamone, Polym. Prepr. Am. Chem. G. Overberger, T. W. G. Overberger, M. Morimoto, I. C. Salamone, Macromolecules 2, 553 (1969) T. Okubo, N. Ise, J. Org. Chem. 38, 3120 (1973) Y. Okahata, Y. Kunitake, J. Polym. , Polym. Chem. Ed. G. Overberger, Y, Kawakami, J. Polym. , Polym. Chem. Ed. 16, 1237; 1249 (1978) S. Shinkai, Sh. Hirakawa, M.

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