Reaktion #573594

Reaktionsgleichung

2,5-dichloro-2,5-dimethylhexane

dichloromethane

3-methyl anisole

→

1,1,4,4,7-pentamethyl-5-methoxy-1,2,3,4-tetrahydronaphthalene

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONAfter the addition
2. 2
   Temperaturthe temperature maintained for an additional 2.5 hours
3. 3
   TemperaturThe solution was then cooled to 5° C.
4. 4
   Sonstigequenched with water
5. 5
   WaschenAfter transfer to a separatory funnel, the solution was washed with water
6. 6
   Trocknentwice with brine, dried over anhydrous sodium sulfate
7. 7
   Sonstigerotary evaporated

Vorschrift

The starting material 1,1,4,4,7-pentamethyl-5-methoxy-1,2,3,4-tetrahydronaphthalene was prepared as follows. First, a 500 flask was charged with 230 ml dichloromethane, 19 g TiCl4, and 18.3 g 2,5-dichloro-2,5-dimethylhexane, at 22° C. Next, 3-methyl anisole (12.2 g in 20 ml dichloromethane) was added dropwise over a period of an hour. After the addition was completed, the solution was heated to 35° C. and the temperature maintained for an additional 2.5 hours. The solution was then cooled to 5° C. and quenched with water. After transfer to a separatory funnel, the solution was washed with water, then twice with brine, dried over anhydrous sodium sulfate, and rotary evaporated to give a crude product (23.78 g) containing 79.4% (by area % GC) of 1,1,4,4,7-pentamethyl-5-methoxy-1,2,3,4-tetrahydronaphthalene.

Quelle