In spite of remarkable progress in the development of catalytic systems for oxidation at mild conditions, their application and further development are limited by the absence of cheap sources of reduced oxygen forms (H₂O₂, NaOCl, etc). The in situ generation of hydrogen peroxide is very promising to resolving this problem. It is suggested an approach based on in situ production of diluted hydrogen peroxide solutions from air oxygen in a new type electrochemical reactor with a swirled fluidized bed electrode for carrying out oxidative reactions with organic compounds. The reactor allows to process simultaneously the oxidant production and the oxidative reactions and to utilize entire reaction volume in contrast to electrochemical reactors with flat electrodes geometry. Reactor permits to use a variety of homogeneous and heterogeneous catalytic systems which require hydrogen peroxide.