Hydrogen Bromide → 1-Bromo-5-(4-chlorophenyl)-2-methylbenzene

HRID 661777Notes

Reaction equation

HRID 661777 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:9]=[CH:10][C:11]([CH3:15])=[C:12]([CH:14]=2)N)=[CH:4][CH:3]=1.N([O-])=O.[Na+].[BrH:20]>O>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:9]=[CH:10][C:11]([CH3:15])=[C:12]([Br:20])[CH:14]=2)=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 260Hydrogen Bromide2×HCID 233905465-(4-Chlorophenyl)-2-methylanilineHCID 23668193Sodium Nitrite

Product 1

HCID 594459301-Bromo-5-(4-chlorophenyl)-2-methylbenzene

Reagents, catalysts & solvents 1

HCID 962WaterSolvent2×

Conditions

Temperature
-5 °C

Procedure

Hydrobromic acid (48% wt. in water, 120 ml) is added dropwise to a suspension of 5-(4-chlorophenyl)-2-methylaniline (21 g, 0.09 mol) in water (80 ml), and the mixture stirred until the solid is dissolved. The mixture is cooled to −5° C. and a solution of sodium nitrite (10.12 g, 0.14 mol) in water (50 ml) is added dropwise, maintaining the temperature at 0-5° C. The reaction mixture is stirred for 1 hour, then added to a pre-cooled solution of cuprous bromide (17.9 g, 0.12 mol) in hydrobromic acid (48% wt. in water, 120 ml) at 0° C. The reaction mixture is stirred and allowed to warm to room temperature overnight. The mixture is extracted with ethyl acetate, and the organic extracts are combined, dried over anhydrous sodium sulfate, filtered and the filtrate concentrated in vacuo. The residue is further purified by column chromatography on silica gel, eluting with 2% ethyl acetate in hexane to give 5-(4-chlorophenyl)-2-methyl-1-bromobenzene (15.0 g).

Workup

  1. dissolutionis dissolved
  2. temperaturemaintaining the temperature at 0-5° C
  3. stirringThe reaction mixture is stirred for 1 hour
  4. stirringThe reaction mixture is stirred
  5. temperatureto warm to room temperature overnight
  6. extractionThe mixture is extracted with ethyl acetate
  7. dry with materialdried over anhydrous sodium sulfate
  8. filtrationfiltered
  9. concentrationthe filtrate concentrated in vacuo
  10. customThe residue is further purified by column chromatography on silica gel
  11. washeluting with 2% ethyl acetate in hexane

Sources & evidence

ORD record
ord-4de1051c36844e448b2828032d6a1077
Source dataset
uspto-grants-2011_12
Patent number
US08084649B2

Reaction notes

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