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Metal-hydroperoxy species

The metal peroxo species is thus formed in solution and, in general, it can be isolated by adding to the reaction mixture a suitable ligand (equation 2). This procedure does not vary much with the metal or with the nature of the ligand and it is still based on the old method reported by Mimoun and coworkers about 30 years ago. The intermediate formation of a hydroperoxy species has been postulated and in some cases observed (see below). [Pg.1058]

This method of preparation was originally reported by Mimoun and coworkers.74 The intermediate hydroperoxy complex is rarely isolated, especially in the presence of hydrogen peroxide, however if an alkylperoxide is employed, then the ring closure reaction does not take place and alkylperoxo species are formed.75 The triangular metal oxirane species formed is of immense importance for the purpose of oxygen transfer to organic substrates. [Pg.53]

Polymer hydroperoxy radical, formation of oxidized groups, 197 Polymer media, preparation of elaborate metal species, 238... [Pg.481]

The sulfonic acid groups in the proton exchange membrane have a high affinity for many cationic species. Replacement of the protons by the contaminant cations will result in reduced conductivity of the membrane and performance loss. In addition, the membrane morphology and structure can be affected. An additional degradation issue associated with contaminant metal ions is the occurrence of Fenton s reactions to produce peroxy and hydroperoxy radicals, which in turn will chemically attack the membrane polymer structure. This mechanism is described in section 1.72.1 of this chapter and in chapter 5. The most common Fenton s metal of concern commonly found in the MEA is iron. [Pg.42]


See other pages where Metal-hydroperoxy species is mentioned: [Pg.529]    [Pg.530]    [Pg.529]    [Pg.530]    [Pg.449]    [Pg.657]    [Pg.953]    [Pg.23]    [Pg.221]    [Pg.286]    [Pg.289]    [Pg.324]    [Pg.378]    [Pg.68]    [Pg.4]    [Pg.184]    [Pg.250]   
See also in sourсe #XX -- [ Pg.530 ]




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