Boron tribromide → HCID 131719751, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 4-(4'-methoxyphenyl)methylenehomophthalimide (279 mg, 1 mmol) in anhydrous dichloromethane (10 ml) is added at -78° C. under nitrogen, over a period of 10 min, a 1.0M solution of boron tribromide in dichloromethane (3 ml, 3 mmol). The resulting mixture is stirred for another 1 h at -78° C. and then allowed to warm to room temperature. After stirring for 1.5 h at 20°-25° C. the mixture is cooled to -10° C. and then quenched by dropwise addition of water (10 ml) over a 10-min period. After addition of ethyl acetate (10 ml) the organic layer is separated, washed with water, dried over Na2SO4 and evaporated under vacuum to dryness. The residue is crystallized from ethanol thus giving pure 4-(4'-hydroxyphenyl)methylenehomophthalimide (186 mg, yield 70%).

Provenance & Evidence