Reaktion #3026

Reaktionsgleichung

Hydrogen chloride

m-toluoyl chloride

1,4-dichlorobenzene

Aluminum chloride

→

white crystals

Ausbeute 53.0%

2,5-Dichloro-3'-methylbenzophenone

Ausbeute 53.0%

Lösungsmittel

Ether

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe mixture was heated to 170° C. in 30 min.
2. 2
   TemperaturThe resulting brownish solution was cooled to about 80° C.
3. 3
   workup.ADDITIONpoured onto ice
4. 4
   SonstigeThe organic layer was separated
5. 5
   workup.DISTILLATIONdistilled under vacuum
6. 6
   Sonstigeafter the removal of ether
7. 7
   workup.DISTILLATIONThe residue from distillation
8. 8
   Sonstigewas recrystallized twice from hexane

Vorschrift

A mixture of m-toluoyl chloride (22 g, 0.17 mol) and 1,4-dichlorobenzene (120 g, 0.82 mol) was heated to 100° C. in a flask. Aluminum chloride (60 g, 0.45 mol) was added in one portion. Hydrogen chloride started to evolve from the solution. The mixture was heated to 170° C. in 30 min. and stirred at this temperature for 3 hours. The resulting brownish solution was cooled to about 80° C. and poured onto ice. Ether (50 ml) was added. The organic layer was separated and distilled under vacuum after the removal of ether. The residue from distillation was recrystallized twice from hexane to give 20 g of white crystals (53%).

Quelle