反应详情

6.0 g (0.03 mol) of 2-(4'-propylcyclohexyl)propane-1,3-diol, 6.6 g (0.03 mol) of 4-bromo-3,5-difluorobenzaldehyde and 0.3 g of TsOH were dissolved in 60 cm3 of dichloromethane, and it was refluxed for 3 hours on a hot water bath while removing the water produced with a Dean-Stark trap. After washing the reactant on water, the dichloromethane was removed. The residue was recrystallized from a solvent mixture of acetone and methanol to obtain 7.3 g (0.018 mol) of 2-(4'-bromo-3',5'-difluorophenyl)-5-(4'-propylcyclohexyl)-1,3-dioxane(trans-cis form mixture).

1. temperatureit was refluxed for 3 hours on a hot water bath
2. customwhile removing the water
3. customproduced with a Dean-Stark trap
4. washAfter washing the reactant on water
5. customthe dichloromethane was removed
6. customThe residue was recrystallized from a solvent mixture of acetone and methanol