2.98 g of 3,5-dibromobenzoyl chloride and 3.58 g of 4-biphenylcarbonitrile were dissolved in 40 mL of chloroform. The obtained solution was cooled to 0° C., and 2.99 g of antimony pentachloride was added dropwise to the cooled solution. The obtained mixed liquid was stirred at room temperature for 10 minutes, and then, heated under reflux for 14 hours. The obtained reaction mixture was cooled to room temperature, and then distilled under a reduced pressure to remove chloroform to give 4,6-bis(4-biphenylyl)-2-(3,5-dibromophenyl)-1,3,5-oxadiazin-1-ium=hexachloroantimonate as a red solid.
