Acetic Acid → [1,1'-Biphenyl]-4,4'-dicarboxaldehyde

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In a 50 ml three-necked flask equipped with a magnetic stirrer, a reflux condenser and a thermometer, 4.28 g (20 mmols) of 4,4′-bishydroxymethylbiphenyl and 10 ml of (166 mmols) of acetic acid were charged, followed by heating to 75° C. An aqueous solution prepared by dissolving 2.04 g (13.5 mmols) of sodium bromate in 10 ml of water was added dropwise, and then the mixture was stirred at 75° C. until a color of bromine disappears. To the system, 50 ml of water was added and, after filtration, the resulting substance was dried to obtain 4.25 g of 4,4′-bisformylbiphenyl as a white crystal. Yield: 99.9%. It was confirmed by GS-MS that a molecular ion peak is 209.

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