Boron tribromide → 4-(4'-Hydroxyphenoxy)biphenyl

HRID 1909618Notes

Reaction equation

C[O:2][C:3]1[CH:21]=[CH:20][C:6]([O:7][C:8]2[CH:13]=[CH:12][C:11]([C:14]3[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=3)=[CH:10][CH:9]=2)=[CH:5][CH:4]=1.B(Br)(Br)Br.O.ClCCl>ClCCl>[C:11]1([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[CH:12]=[CH:13][C:8]([O:7][C:6]2[CH:20]=[CH:21][C:3]([OH:2])=[CH:4][CH:5]=2)=[CH:9][CH:10]=1

Participants

Conditions

Temperature: -78 °C

Procedure

To a solution of the product from step 1 (0.5 g, 1.81 mmol) in dichloromethane (10 mL) at −78° C. was added boron tribromide (1.0 M solution in dichloromethane, 5.43 mL, 5.43 mmol) dropwise over 5-10 min. The subsequent mixture was stirred at −78° C. for an hour followed by ambient temperature for 1 h. After cooling the reaction mixture to 0° C., it was slowly added to cold water/dichloromethane (50 mL/50 mL). The organic portion was washed with water, brine, dried over anhydrous Na2SO4 and concentrated in vacuo. The crude product was purified by silica gel flash chromatography using hexane/EtOAc (gradient system) to give the title compound (0.24 g, 47%) as an off-white solid.

Workup

temperatureAfter cooling the reaction mixture to 0° C.
washThe organic portion was washed with water, brine
dry with materialdried over anhydrous Na2SO4
concentrationconcentrated in vacuo
customThe crude product was purified by silica gel flash chromatography

Sources & evidence

ORD record: ord-1cde93571fb2424ebbaf8c32d1d26643
Source dataset: uspto-grants-2013_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08598359B2

Reaction notes

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