2-Bromo-9-fluorenone → 9-(2-Biphenylyl)-2-bromo-9-fluorenol

Participants

Reaction Conditions

Reaction Steps

1.3 g (52 mmol) of magnesium was put into a 200 mL three-neck flask and stirred for 0.5 hours while reducing pressure with a rotary pump. Then, under a nitrogen gas stream, 5.0 mL of diethyl ether and one drop of dibromoethane were added. A solution in which 12 g (50 mmol) of 2-bromophenyl was dissolved in 15 mL of diethyl ether was dropped into this mixture at a pace that maintained reflux flow. After completion of dropping, the reaction mixture was refluxed at 50° C. for 3 hours so as to become a Grignard reagent. 12 g (45 mmol) of 2-bromo-9-fluorenone was put into a 200 mL three-neck flask, and after nitrogen substitution in the flask was carried out, 40 mL of diethyl ether was added into the flask. The synthesized Grignard reagent was dropped into this solution, and after completion of dropping, the solution was refluxed at 50° C. for 3 hours, and then stirred at room temperature for 24 hours. After completion of a reaction, the reaction solution was washed with water, and a water layer was extracted with ethyl acetate. The extracted solution and an organic layer were combined and washed with saturated saline, and then dried with magnesium sulfate. After drying, this mixture was subjected to suction filtration, and when a filtrate was concentrated, 19 g of a light yellow, powdery solid of 9-(biphenyl-2-yl)-2-bromofluoren-9-ol that was a target matter was obtained with the yield of 91%.

Provenance & Evidence