Boron tribromide → 4-((5-Bromo-2-chlorophenyl)methyl)phenol

HRID 2403775Notes

Reaction equation

HRID 2403775 reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([Cl:8])=[C:4]([CH2:9][C:10]2[CH:15]=[CH:14][C:13]([O:16]CC)=[CH:12][CH:11]=2)[CH:3]=1.B(Br)(Br)Br>ClCCl>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([Cl:8])=[C:4]([CH:3]=1)[CH2:9][C:10]1[CH:15]=[CH:14][C:13]([OH:16])=[CH:12][CH:11]=1

Participants

4

Reactant 2

HCID 25134Boron tribromideHCID 99964494-Bromo-1-chloro-2-(4-ethoxy-benzyl)-benzene2×

Product 1

HCID 574237514-((5-Bromo-2-chlorophenyl)methyl)phenolYield 68%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a stirred solution of 4-bromo-1-chloro-2-(4-ethoxybenzyl)benzene (intermediate B) (747 g, 2.31 mol) in dichloromethane was added slowly boron tribromide (1.15 kg, 4.62 mol) at −78° C. The reaction mixture was allowed to warm to room temperature. When the reaction was complete as measured by TLC, the reaction was quenched with water. The mixture was extracted with dichloromethane. The organic layer was washed with an aqueous solution of saturated sodium bicarbonate, then with water, and then with brine, and dried over Na2SO4. The residue was concentrated and then recrystallized in petroleum ether to obtain intermediate H as a white solid (460 g, yield 68%). 1H NMR (CDCl3, 400 MHz): δ 7.23˜7.29 (m, 3H), 7.08 (d, J=8.8 Hz, 2H), 6.79 (d, J=8.8 Hz, 2H), 5.01 (s, 1H), 4.00 (s, 2H).

Workup

  1. customthe reaction was quenched with water
  2. extractionThe mixture was extracted with dichloromethane
  3. washThe organic layer was washed with an aqueous solution of saturated sodium bicarbonate
  4. dry with materialwith water, and then with brine, and dried over Na2SO4
  5. concentrationThe residue was concentrated
  6. customrecrystallized in petroleum ether

Sources & evidence

ORD record
ord-e5217036196c4bd08718c805e0cb185b
Source dataset
uspto-grants-2014_08
Patent number
US08802637B2

Reaction notes

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