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Sharma, J. Schubert, J. Am. Chem. 91, 6291 (1969); 92, 822 (1970) [83] H. Sigel, Angew. Chem. Int. Ed. Engl. A. Bekturov, S. E. B. Sigitov, Polymer 27, 1269 (1986) [85] V. B. Sigitov, S. E. Kudaibergenov, E. A. Bekturov, Koord. Khim. 13, 600 (1987) [86] P. G. Meinders, G. Challa, in Polymeric Amines and Ammonium Salts. E. J. Goethals, editor Pergamon Press Oxford, New York, Toronto, Sydney, Paris, Frankfurt, 1980 [88] M. Takeishi, M. Ueda, Sh. Hayama, Makromol. , Rapid Commun. 2, 167 (1981) [89] T.

Whenever an equivalent amount of the second metal is added to a P4VP-copper complex, the activity of the particular mixed polymermetal complexes changes. For instance, manganese ions promote the catalytic activity of this complex, whereas chromium and iron ions inhibit it. A mixed P4VP-Cu(II), Mn(II1) complex increases not only the reaction rate but also the yield and molecular weight of PPO. A rapid oxidation-reduction reaction as depicted below is expected in the presence of Mn ions: Cu(I)+Mn(III) P4VP Cu(II)+Mn(II) As a result, DMP oxidation in the presence of the mixed catalyst involves the following cycles: The substrate coordinates with the copper complex and thereby becomes activated.

Chem. 180, 1099 (1979) [92] T. M. P. L. Khidekel, Izv. Akad. Nauk SSSR, Ser. Khim.

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