Method for producing crystals of a biphenanthrene skeleton-containing dihydroxy compound

Abstract

An object of the present invention is to provide a method for producing a biphenanthrene-skeleton-containing dihydroxy compound more efficiently and stably. To achieve the above object, the present invention provides a method for producing crystals of a biphenanthrene-skeleton-containing dihydroxy compound represented by general formula (1a), the method comprising a crystallization step of precipitating crystals of the biphenanthrene-skeleton-containing dihydroxy compound represented by general formula (1a) from a crystallization solution containing (i) the biphenanthrene-skeleton-containing dihydroxy compound represented by general formula (1a) and (ii) at least one organic solvent selected from the group consisting of an aromatic hydrocarbon solvent having