反应详情

20 g (0.132 moles) of 90 percent pure 4-hydroxymethylbenzaldehyde were stirred for 2 hours at 80° C. under an argon atmosphere with 50 ml of 37 percent HCl (0.58 moles) and 200 ml of toluene. After cooling to room temperature, the aqueous phase was separated off and the toluene phase was evaporated in vacuo. This gave 16.2 g of crude product which, according to NMR, contained 78.8% by weight of 4-chloromethylbenzaldehyde, 10% by weight of 1,4-bis-chloromethylbenzene and 11.2% by weight of an unknown substance. A 4-chloromethylbenzaldehyde yield of 12.8 g, corresponding to 62.5% of the theoretical yield was calculated from the NMR result.

1. customthe aqueous phase was separated off
2. customthe toluene phase was evaporated in vacuo