Benzyl Alcohol → 1-(Benzyloxy)-3-bromo-5-fluorobenzene

HRID 2254150Notes

Reaction equation

HRID 2254150 reaction equation
[CH2:1]([OH:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[H-].[Na+].[Br:11][C:12]1[CH:17]=[C:16](F)[CH:15]=[C:14]([F:19])[CH:13]=1>CC(N(C)C)=O>[Br:11][C:12]1[CH:17]=[C:16]([O:8][CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)[CH:15]=[C:14]([F:19])[CH:13]=1

Participants

5

Reactant 3

HCID 244Benzyl AlcoholHCID 24758Sodium hydrideHCID 1363131-Bromo-3,5-difluorobenzene

Product 1

HCID 112545161-(Benzyloxy)-3-bromo-5-fluorobenzeneYield 75%

Reagents, catalysts & solvents 1

HCID 31374DimethylacetamideSolvent

Procedure

A mixture of benzyl alcohol (10 g), sodium hydride (4.44 g of a 50% w/w dispersion in meneral oil) and dimethylacetamide (180 ml) was stirred at ambient temperature for 1 hour; 1-bromo-3,5-difluorobenzene (10.65 ml) was added and the exothermic reaction mixture was stirred for 2 hours. The mixture was evaporated and the residue was partitioned between methylene chloride and water. The organic layer was separated, washed with water, dried (MgSO4) and evaporated. The residue was purified by column chromatography using a 20:1 v/v mixture of petroleum ether (b.p. 60°-80° C.) and ethyl acetate as eluent. There was thus obtained, as a liquid, benzyl 3-bromo-5-fluorophenyl ether (19.5 g, 75%).

Workup

  1. stirringthe exothermic reaction mixture was stirred for 2 hours
  2. customThe mixture was evaporated
  3. customthe residue was partitioned between methylene chloride and water
  4. customThe organic layer was separated
  5. washwashed with water
  6. dry with materialdried (MgSO4)
  7. customevaporated
  8. customThe residue was purified by column chromatography
  9. additiona 20:1 v/v mixture of petroleum ether (b.p. 60°-80° C.) and ethyl acetate as eluent

Sources & evidence

ORD record
ord-1a39e4ecb5484d4f9f8c22642d8e68cf
Source dataset
uspto-grants-1993_08
Patent number
US05234950

Reaction notes

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