Dimethylformamide → 5-[N-(4-formylphenyl)-N-(4-tolyl)amino]acenaphthene

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4.7 g (0.014 mol) of the above prepared 5-[N-(4-tolyl)-N-phenylamino]acenaphthene was dissolved in 30 ml of N,N-dimethylformamide, and 3.22 g (0.021 mol) of phosphorus oxychloride was dropwise added thereto at room temperature for 10 minutes. After the temperature was raised to 50° C., and the mixture was stirred for 14 hours. The reaction was determined to be finished when disappearance of 5-[N-(4-tolyl)-N-phenylamino]acenaphthene was identified. The reaction product was poured into an aqueous solution having 10 g (0.23 mol) of 93% sodium hydroxide dissolved in 250 ml of water. The resultant mixture was cooled to precipitate a crystal, which was then filtrated, washed with water and dried to obtain 4.94 g (yield: 97.1%) of 5-[N-(4-formylphenyl)-N-(4-tolyl)amino]acenaphthene.

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