METHOD FOR PREPARING ALDEHYDES Russian patent published in 2003 - IPC

FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to method for preparing aldehydes that are intermediate compounds in organic synthesis. Method involves oxidation of paraffins, toluene or alcohols with nitrous oxide at temperature from 350 C to 575 C in the presence of heterogeneous catalyst taken among crystalline silicate of the general formula yMe₂O_n×El₂O_mSiO₂, wherein x = 10^-5÷6,5×10^-2; y = 10^-5÷6,5×10^-2; Me is alkaline or earth- -alkaline metal; El is element taken among Al and Fe; n and m mean valence of metal Me and element El, respectively; transient metal oxides in combination with non-transient metal oxides or combination of precious metal, except for silver, with SiO₂, Al₂O₃, TiO₂, or C. As a rule, the heterogeneous catalyst is taken among crystalline silicate with Al₂O₃, SiO₂ or their mixture as a binding agent. Usually, the process is carried out in nitrous oxide excess or in excess of substance to be oxidized in the presence of diluting gas where nitrogen, argon, helium, carbon dioxide or any their mixture is used. Method provides preparing aldehydes for a single step being at lower temperature when alcohols are used. EFFECT: improved preparing method. 5 cl, 3 tbl, 14 ex