反应详情

Boron tribromide (1.0M dichloromethane solution, 50 ml, 50 mmol) was added to a mixture of 2-methoxy-9H-xanthen-9-one (5.66 g, 25.0 mmol) and dichloromethane (50 ml), and the mixture was stirred for 3 hours. The reaction mixture was poured into ice water and the reaction product was extracted with chloroform. The extract was washed with water and saturated sodium chloride aqueous solution in that order, dried over anhydrous magnesium sulfate, and then concentrated under a reduced pressure to give the title compound (5.00 g, 23.6 mmol, 94%) as yellow crystals.

1. extractionthe reaction product was extracted with chloroform
2. washThe extract was washed with water and saturated sodium chloride aqueous solution in that order
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated under a reduced pressure