p-Bromochlorobenzene → HCID 12319462, compound

HRID 2379686Notes

Reaction equation

HRID 2379686 reaction equation
Br[C:2]1[CH:7]=[CH:6][C:5]([Cl:8])=[CH:4][CH:3]=1.C([Li])CCC.[Br:14][C:15]1[CH:22]=[CH:21][CH:20]=[CH:19][C:16]=1[CH:17]=[O:18]>CCCCCC>[Br:14][C:15]1[CH:22]=[CH:21][CH:20]=[CH:19][C:16]=1[CH:17]([OH:18])[C:2]1[CH:7]=[CH:6][C:5]([Cl:8])=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 7806p-BromochlorobenzeneHCID 811292-BromobenzaldehydeHCID 178418339Butyllithium

Product 1

HCID 12319462HCID 12319462, compoundYield 99%

Reagents, catalysts & solvents 1

HCID 8058HexaneSolvent

Procedure

A solution of 23.0 g (120 mmole) of 4-bromochlorobenzene in 150 ml of dry tetrahydrofura: was cooled to -78° C. under nitrogen and 78 ml (120 mmole) of 1.55M n-butyllithium in hexane was added dropwise at a rate to maintain temperature below -60° C. After stirring an additional 15 minutes, 14.0 ml (120 mmole) of 2-bromo-benzaldehyde was added and the reaction was stirred for 15 minutes. The reaction was quenched at -78° C. with saturated aqueous ammonium chloride and allowed to warm to room temperature. The reaction solution was diluted with 300 ml of diethyl ether and washed with three 75 ml portions of 1.0M sodium bisulfite, followed by 50 ml of 1.0M sodium hydroxide, 100 ml of water, and 50 ml of saturated sodium chloride. After drying over magnesium sulfate, the solvent was removed to give 35.3 g (99%) of crude 2-bromo-α -(4-chlorophenyl)benzyl alcohol as a pale yellow oil.

Workup

  1. temperatureto maintain temperature below -60° C
  2. stirringthe reaction was stirred for 15 minutes
  3. customThe reaction was quenched at -78° C. with saturated aqueous ammonium chloride
  4. additionThe reaction solution was diluted with 300 ml of diethyl ether
  5. washwashed with three 75 ml portions of 1.0M sodium bisulfite
  6. dry with materialAfter drying over magnesium sulfate
  7. customthe solvent was removed

Sources & evidence

ORD record
ord-754a148e2ecc45f5a9118bcffc5f6755
Source dataset
uspto-grants-1994_11
Patent number
US05364843

Reaction notes

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