反应详情

36.6 g (170 mmol) of pyridinium chlorochromate are placed at room temperature in 120 ml of dichloromethane under N2, and a solution of 20.4 g (113 mmol) of 4-benzyloxybutanol in 20 ml of dichloromethane is added. The reaction mixture rapidly becomes dark and the reaction is slightly exothermic. The reaction mixture is stirred at room temperature for 31/2 hours. The supernatant dichloromethane phase is decanted off and concentrated by evaporation in a rotary evaporator. The residue is filtered over 100 g of silica gel. The product fractions are concentrated by evaporation in a rotary evaporator and distilled under a high vacuum over a 10 cm Vigreux column. 4-benzyloxybutanal is obtained, b.p.0.1 =72°-73°.

1. customThe supernatant dichloromethane phase is decanted off
2. concentrationconcentrated by evaporation in a rotary evaporator
3. filtrationThe residue is filtered over 100 g of silica gel
4. concentrationThe product fractions are concentrated by evaporation in a rotary evaporator
5. distillationdistilled under a high vacuum over a 10 cm Vigreux column