1,3-Dibromopropane → 1-[4-(3-Bromopropoxy)-3-methylphenyl]ethanone

HRID 2394544Notes

Reaction equation

HRID 2394544 reaction equation
[CH3:1][C:2]1[CH:7]=[C:6]([C:8]([CH3:10])=[O:9])[CH:5]=[CH:4][C:3]=1[OH:11].[Br:12][CH2:13][CH2:14][CH2:15]Br>C(#N)C>[Br:12][CH2:13][CH2:14][CH2:15][O:11][C:3]1[CH:4]=[CH:5][C:6]([C:8](=[O:9])[CH3:10])=[CH:7][C:2]=1[CH3:1]

Participants

4

Reactant 2

HCID 80011,3-DibromopropaneHCID 701354'-Hydroxy-3'-methylacetophenone

Product 1

HCID 99933191-[4-(3-Bromopropoxy)-3-methylphenyl]ethanone

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

A mixture of 4-hydroxy-3-methylacetophenone (14.5 g, 96 mmol), K2 CO3 (17.5 g, 144 mmol), and 1,3-dibromopropane (30 g, 144 mmol) in acetonitrile (400 ml) was heated at reflux for 6 hours. At the end of the reaction, the solvent was removed on a rotary evaporator, and the crude solid was extracted into dichloromethane (750 ml). The insoluble inorganics were filtered off. The dichloromethane solution was concentrated again to a crude oil (34.5 g). Purification was effected by flash chromatography over a silica gel column (SiO2, 150 g; eluted with 7:3 hexane:dichloromethane, 2 l; and dichloromethane 2 l). The material thus purified weighed 14.6 g (56%) and was recrystallized from ethanol. Recrystallization again from ethanol gave analytically pure 1-[4-(3-bromopropoxy)-3-methylphenyl]ethanone, m.p.=59°-61° C.

Workup

  1. temperaturewas heated
  2. temperatureat reflux for 6 hours
  3. customAt the end of the reaction
  4. customthe solvent was removed on a rotary evaporator
  5. extractionthe crude solid was extracted into dichloromethane (750 ml)
  6. filtrationThe insoluble inorganics were filtered off
  7. concentrationThe dichloromethane solution was concentrated again to a crude oil (34.5 g)
  8. customPurification
  9. washwas effected by flash chromatography over a silica gel column (SiO2, 150 g; eluted with 7:3 hexane:dichloromethane, 2 l; and dichloromethane 2 l)
  10. customThe material thus purified
  11. customwas recrystallized from ethanol
  12. customRecrystallization again from ethanol

Sources & evidence

ORD record
ord-cb8dc8f36ccc424eb56323bc62c39e62
Source dataset
uspto-grants-1998_09
Patent number
US05811430

Reaction notes

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