[en] The methods of synthesis and reactions of organometallic compounds geroxides (OMC) are discussed. They are obtained by OMC oxidation with the air oxygen or by inter reaction of OMC or their functional derivatives with inorganic and organic peroxides. The OMC autooxidation is shown to qenerate free radicals at the decay of OMC - oxygen complexes which enter the common chemical transformations. OMC peroxides possess high reactivity. The heterolytic cleava.ge of M-O bond occurs in reactions with water, HCl and H₂SO₄. Hydrolysis of the 1-3 groups OMC peroxides affords H₂O₂ quantitatively. The homolytic reactions with the C-O bond cleavage occur under action of heat, liqht or radical initiation. Radical decay are often followed by a rearrangement