The invention relates to a method for producing monocarbonyl compounds or biscarbonyl compounds or hydroxyl compounds by ozonizing, unsaturated organic carbon compounds that, per molecule, have one or more olefinic or aromatic double bonds, which can be cleaved by ozone, and by subsequently processing the ozonization products. According to the inventive method, unsaturated organic carbon compounds that, per molecule, have one or more olefinic or aromatic double bonds, which can be cleaved by ozone, are: (a) in 1 to 2 steps, continuously reacted with ozone in stoichiometric quantities or in excess while using counter educt currents and being in an organic solvent or in an aqueous solution inside a device, which consists of one to two absorption apparatuses, of devices for carrying away reaction heat, and of devices for separating the gas and liquid phases, and; (b) the peroxides resulting therefrom are, according to reaction parameters from step (a), converted into the corresponding monocarbonyl compounds or biscarbonyl compounds or hydroxyl compounds either by continuous or discontinuous hydrogenation, oxidation or heating.