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A mixture of 2-(benzyloxy)-4-fluorobenzyl alcohol (6.54 g) and manganese(IV) oxide (9.04 g) in chloroform (70 ml) was refluxed and stirred for 2 hr. The insoluble material was removed by filtration and washed with chloroform. The filrate was evaporated and the residue (6.7 g) was chromatographed over silica gel (90 g) eluting with a mixture of hexane and dichloromethane (5:1) to dichloromethane to give a colorless oil of 2-(benzyloxy)-4-fluorobenzaldehyde (3.8 g, 59%).

1. temperaturewas refluxed
2. customThe insoluble material was removed by filtration
3. washwashed with chloroform
4. customThe filrate was evaporated
5. customthe residue (6.7 g) was chromatographed over silica gel (90 g)
6. washeluting with a mixture of hexane and dichloromethane (5:1) to dichloromethane