Process for preparation of dibenzocyclooctadiene type lignan

摘要

A dibenzocyclooctadiene type lignan can be efficiently prepared by extracting a plant containing a dibenzocyclooctadiene type lignan with a low polar solvent, subjecting the resulting extract to partition extraction with a water-insoluble low polar solvent and a water- soluble high polar solvent, at least one time, and recovering the dibenzocyclooctadiene type lignan from the layer of the water-soluble high polar solvent.