[摘要]:The reaction of vinylic silanes with ozone provides synthetically versatile b-hydroxy or a-formyl silyl peroxides in good yield without normal fission of the C:C bond. The obtained a-formyl silyl peroxides serve as good precursors for stereochem. defined diol or triol derivs. via nucleophilic addn. to the formyl group and redn. of the peroxide moiety.