Bromine → Acetophenone

HRID 1359179Notes

Reaction equation

HRID 1359179 reaction equation
[CH3:1][C:2]([C:4]1[CH:9]=[CH:8][C:7](S(C)(=O)=O)=[CH:6][CH:5]=1)=[O:3].BrBr>C(O)(=O)C.Cl.O>[C:2]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1)(=[O:3])[CH3:1]

Participants

6

Reactant 2

HCID 24408BromineHCID 825294-Methylsulfonylacetophenone

Product 1

HCID 7410Acetophenone

Reagents, catalysts & solvents 3

HCID 176Acetic AcidSolvent2×HCID 313Hydrochloric AcidSolventHCID 962WaterSolvent

Procedure

To a stirred solution of the acetophenone prepared in Step 2 (11.91 g, 60.5 mmol) in glacial acetic acid (133 ml) and hydrochloric acid (0.11 ml) at ambient temperature, was added a solution of bromine (8.22 g, 51.4 mmol) in glacial acetic acid (9.3 ml) over a period of three hours. The reaction mixture was diluted with water (500 ml) and extracted with chloroform. The combined chloroform extracts were dried (MgSO4) and concentrated in vacuo to give 15.66 g of crude 2-bromo-4′-methylsulfonyl)acetophenone: 1H NMR (CDCl3) δ3.10 (s, 3H), 4.45 (s, 2H), 8.08 (d, J=9 Hz, 2H), 8.17 (d, J=9 Hz, 2H). The sample was used without further purification.

Workup

  1. extractionextracted with chloroform
  2. dry with materialThe combined chloroform extracts were dried (MgSO4)
  3. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-87ee679204fc4d91a6aff2be42f7e99a
Source dataset
uspto-grants-2003_07
Patent number
US06599934B1

Reaction notes

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