FIELD: chemistry.
SUBSTANCE: as catalyst acidic alkylammonium salts of vanadium-containing polyoxotungstates (Alkm-nHn)[γ-XV2W10O40] are used, where the central atom of the polyoxometallate X can be Si or P, preferably P; the alkylammonium cation of the polyoxotungstate Alk=(CkH2k+1)4N, k=4-6; the number of protons n in the cationic part of the polyoxotungstate (Alkm-nHn)[γ-XV2W10O40] varies from 0 to 2.
EFFECT: method enables to obtain the end product with high output using small amounts of the catalyst.
8 cl, 1 tbl, 25 ex
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