反应详情

A solution of 1-(4′-phenylsulfonylphenyl)benzimidazole (6.7 g, 20 mmol) in dichloromethane (100 ml) is admixed at −10° C. with trimethyloxonium tetrafluoroborate (3.3 g, 22 mmol) and stirred under argon for 16 h. After adding ethanol, the precipitate formed is filtered off and washed with cold petroleum ether. Yield: 80%.

1. customthe precipitate formed
2. filtrationis filtered off
3. washwashed with cold petroleum ether