METHOD OF PRODUCING DIHYDROQUERCETIN FROM SIBERIAN LARCH WOOD Russian patent published in 2017 - IPC C07D311/32 

FIELD: chemistry.

SUBSTANCE: method of producing dihydroquercetin is that larch wood, previously ground to a particle size of 1-3 mm, is dried to a moisture content of less than 1% and subjected to the mechanochemical treatment in the mill-activator for 2-3 minutes, extracted with a 10-25% aqueous solution of ethyl alcohol by boiling for 0.5 hour with the hydro module 15, the extract is filtered, concentrated under vacuum, cooled and mixed with ethyl alcohol, precipitating arabinogalactan, the remaining solution is concentrated to a dry residue, which is dissolved in ethyl alcohol, activated charcoal is added, and the solution is stirred for 10 minutes, filtered, concentrated under vacuum, and dihydroquercetin is produced.

EFFECT: method improvement.

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