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Novel difluoro aromatic ketone monomer,(2,6-difluorophenyl)[3-[(3,5-dimethoxyphenyl)methyl]-5-methoxyphenyl] methanone(DFDM),is prepared via three-step reactions,including nucleophilic addition reaction between 2,6-difluorobenzonitrile and 3-methoxy-5-methylphenyl magnesium bromide,bromonation reaction and palladium catalyzed Suzuki coupling reaction.