Reaktion #64037

Reaktionsgleichung

hydrochloric acid

(R)-3-ethyl-1,1,4,4,6-pentamethyl-1,2,3,4-tetrahydronaphthalene

acetyl chloride

aluminum chloride

→

(R)-7-acetyl-3-ethyl-1,1,4,4,6-pentamethyl-1,2,3,4-tetrahydronaphthalene

Ausbeute 96.2%

Lösungsmittel

1,2-dichloroethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwhile cooling with ice
2. 2
   WaschenThe organic layer was washed with dilute hydrochloric acid, saturated sodium carbonate solution and saturated sodium chloride solution in order
3. 3
   Trocknendried over anhydrous sodium sulfate
4. 4
   Einengenconcentrated

Vorschrift

To a solution of (R)-3-ethyl-1,1,4,4,6-pentamethyl-1,2,3,4-tetrahydronaphthalene ([α]546 +2.2° (C=0.95 in ethanol)) (36.5 g; 0.159 mol) and acetyl chloride (13.7 g; 0.174 mol) in 1,2-dichloroethane (100 ml), anhydrous aluminum chloride (25.3 g; 0.190 mol) was added at 20° C., and the resulting mixture was stirred for 1 hour. The reaction mixture was treated with dilute hydrochloric acid while cooling with ice. The organic layer was washed with dilute hydrochloric acid, saturated sodium carbonate solution and saturated sodium chloride solution in order, dried over anhydrous sodium sulfate and concentrated t give (R)-7-acetyl-3-ethyl-1,1,4,4,6-pentamethyl-1,2,3,4-tetrahydronaphthalene (41.5 g; 0.153 mol; 96%). B.P., 120° C./0.1 mmHg. [α]365 -46.1° (C=0.97 in ethanol).

Quelle