Benzo(B)Thiophene → Benzo(b)thiophene, 3-bromo-

HRID 1491677Notes

Reaction equation

HRID 1491677 reaction equation
[S:1]1[CH:5]=[CH:4][C:3]2[CH:6]=[CH:7][CH:8]=[CH:9][C:2]1=2.[Br:10]Br>C(Cl)(Cl)(Cl)Cl>[Br:10][C:4]1[C:3]2[CH:6]=[CH:7][CH:8]=[CH:9][C:2]=2[S:1][CH:5]=1

Participants

4

Reactant 2

HCID 7221Benzo(B)ThiopheneHCID 24408Bromine

Product 1

HCID 123250Benzo(b)thiophene, 3-bromo-Yield 48.4%

Reagents, catalysts & solvents 1

HCID 5943Carbon TetrachlorideSolvent2×

Procedure

Dissolve benzo[b]thiophene (23 g, 0,170 mmol) in carbon tetrachloride (80 mL). Add, by dropwise addition, a solution of bromine (26.85 g, 0,168 mmol) in carbon tetrachloride (30 mL) and stir at room temperature for 2 days. Quench with a 1M solution of sodium thiosulfate and separate the organic phase. Extract the aqueous phase with carbon tetrachloride, combine the organic phases and dry (MgSO4). Evaporate the solvent in vacuo and purify by distillation to give 3-bromobenzo[b]thiophene as a pale yellow liquid (17.33 g, 48%); bp 64°-72° C. @ 0.02 mm Hg.

Workup

  1. additionAdd, by dropwise addition
  2. customQuench with a 1M solution of sodium thiosulfate
  3. customseparate the organic phase
  4. extractionExtract the aqueous phase with carbon tetrachloride
  5. dry with materialdry (MgSO4)
  6. customEvaporate the solvent in vacuo
  7. distillationpurify by distillation

Sources & evidence

ORD record
ord-503adf4606634cd59780046c6434c8ff
Source dataset
uspto-grants-1994_12
Patent number
US05371093

Reaction notes

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