Reaktion #51271

Reaktionsgleichung

2,5-dichloro-2,5-dimethylhexane

dichloromethane

ammonium chloride

dichloromethane

3-bromophenol

→

3-bromo-5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphth1-ol

Lösungsmittel

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONis added dropwise
2. 2
   Extraktionextracted with dichloromethane
3. 3
   Waschenthe extract is washed with water
4. 4
   Sonstigethe organic phase is separated
5. 5
   Trocknendried over magnesium sulphate
6. 6
   Sonstigeevaporated
7. 7
   SonstigeThe residue obtained
8. 8
   Sonstigeis purified by chromatography on a silica column
9. 9
   Wascheneluted with a mixture
10. 10
    SonstigeAfter evaporating the solvents, 30.00 g (53%) of the expected compound
11. 11
    Sonstigeare collected in the form of white crystals with a melting point of 93° C.

Vorschrift

13.40 g (100.0 mmol) of ammonium chloride and 100 ml of dichloromethane are introduced into a three-necked flask under an argon atmosphere. A solution composed of 34.60 g (199.0 mmol) of 3-bromophenol, 89.00 g (486.0 mmol) of 2,5-dichloro-2,5-dimethylhexane and 300 ml of dichloromethane is added dropwise. The reaction mixture is stirred for sixteen hours at room temperature. The reaction mixture is poured into water and extracted with dichloromethane, the extract is washed with water and the organic phase is separated by settling, dried over magnesium sulphate and evaporated. The residue obtained is purified by chromatography on a silica column eluted with a mixture composed of 80% heptane and 20% dichloromethane. After evaporating the solvents, 30.00 g (53%) of the expected compound are collected in the form of white crystals with a melting point of 93° C.

Quelle