Reaktion #982086

Reaktionsgleichung

1-bromo-2-benzyloxy-4-(1,1-dimethylheptyl)benzene

methyl vinyl ketone

hydrochloric acid

magnesium

→

title compound

Ausbeute 28.0%

4-[2-Benzyloxy-4-(1,1-dimethylheptyl)phenyl]-2-butanone

Ausbeute 28.0%

Lösungsmittel

tetrahydrofuran

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGThe reaction mixture is stirred for 30 minutes longer (t<0° C.)
2. 2
   workup.ADDITIONis then added to 100 ml
3. 3
   SonstigeThe quenched reaction
4. 4
   Extraktionis extracted three times with 150 ml
5. 5
   ExtraktionThe combined ether extract
6. 6
   Waschenis washed twice with 100 ml
7. 7
   Trocknenportions of saturated sodium chloride, dried over magnesium sulfate
8. 8
   Sonstigeevaporated to an oil
9. 9
   SonstigeThe oil was purified via column chromatography on 180 g
10. 10
    Waschenof silica gel eluted with 20% ether-cyclohexane
11. 11
    Sonstigeto yield 1.07 g

Vorschrift

A solution of 3.89 g. (0.010 mol.) of 1-bromo-2-benzyloxy-4-(1,1-dimethylheptyl)benzene in 15 ml. of tetrahydrofuran is slowly added to 0.36 g. (0.015 mol.) of 70-80 mesh magnesium metal. The resultant mixture is refluxed for 20 minutes and is then cooled to -10° C. Cuprous iodide (0.115 g., 0.006 mol.) is added and stirring continued for 10 minutes. To the resultant mixture is slowly added a solution of 0.701 g. (0.010 mol.) of methyl vinyl ketone in 5 ml. of tetrahydrofuran at such a rate that the reaction temperature could be maintained below 0° C. The reaction mixture is stirred for 30 minutes longer (t<0° C.) and is then added to 100 ml. of 1N hydrochloric acid and 100 g. of ice. The quenched reaction is extracted three times with 150 ml. portions of ether. The combined ether extract is washed twice with 100 ml. portions of water, twice with 100 ml. portions of saturated sodium chloride, dried over magnesium sulfate and evaporated to an oil. The oil was purified via column chromatography on 180 g. of silica gel eluted with 20% ether-cyclohexane to yield 1.07 g. (28%) of the title compound as an oil.

Quelle