FIELD: chemical industry. SUBSTANCE: described is method of preparing formyltetrahydropyrans of general formula I. Hydroxymethyltetrahydropyran of general formula II is dehydrogenated in the presence of copper, silver and/or gold catalyst. Formyltetrahydropyrans are useful intermediate products for medicinals and plant protection agents. EFFECT: simplified process and greater efficiency thereof. 9 cl, 5 ex
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