The present study considered the influence of various factors on the catalytic activity of systems based on a combination of tetrakis(oxodiperoxotungsto)phosphate(3-) with quater nary ammonium cations, for example, with methyltri n octylammonium [Me(n C 8 H 17 ) 3 N] + . The catalysts were tested in oxidation of cycloolefins (cyclohexene and cyclooctene), alcohols (octan 1 ol and phenylmethanol), and unsaturated fatty acids (cis 9 octadecenoic and 12 hydroxy 9Z octadecenoic acids) with a 30% hydrogen peroxide solution. These reactions proceed under mild conditions (atmospheric pressure, 80-90 °C) to give carboxylic acids. The catalytic systems were characterized by vibrational (IR and Raman) spectroscopy. The state of the systems formed from various precursors, viz., polyoxometallates and phase transfer cata lysts, was studied. It was demonstrated for the first time that the structure formation of peroxo complexes depends on the nature of the halide anion of the quaternary ammonium salt used. The melting points of individual catalytic complexes were determined. The optimal conditions for oxidation were found.

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