反应详情

Under a nitrogen blanket, 96 g (4 moles) of magnesium shavings in 60 ml of absolute THF (tetrahydrofuran) are placed in a receiver. At 65° C., 1 ml of 1,2-dibromoethane is added and then a solution of 644 g (4 moles) of 2,6-dichlorotoluene in 1.5 liters of absolute THF is dripped in over a period of 21/4 hours. The mixture is then stirred under reflux for 4 hours and cooled to room temperature, and 352.8 g (3.6 moles) of cyclohexanone in 250 ml of absolute THF is added under a nitrogen blanket. After the reaction the Grignard reaction mixture is worked up as usual and the solvent is substantially removed by distillation under reduced pressure. The residue is subjected to incipient distillation (30° to 107° C./0.27 mbar). The crude product remaining (676 g), which already consists to the extent of 90% of 1-(3'-chloro-2'-methylphenyl)-cyclohexanol, can be purified further by column chromatography using toluene as eluant.

1. temperatureunder reflux for 4 hours
2. customAfter the reaction
3. customthe Grignard reaction mixture
4. customis substantially removed by distillation under reduced pressure
5. distillationThe residue is subjected to incipient distillation (30° to 107° C./0.27 mbar)
6. customcan be purified further by column chromatography