反应详情

A mixture of benzoic acid 3,5-dimethyl-benzyl ester (24 g, 0.1M) and NBS (39.16 g, 0.22M) in carbon tetrachloride (200 ml) was refluxed for 3 hr. under a light of 500 W tungsten lamp. After cooling to room temperature, the mixture was filtered and the filtrate was evaporated in vacuo. The residue was dissolved in ether, washed with aqueous saturated sodium bicarbonate solution, dried with anhydrous magnesium sulfate, filtered, and evaporated in vacuo to give 21 g of crude 3-bromomethyl-5-methyl-benzaldehyde.

1. temperaturewas refluxed for 3 hr
2. filtrationthe mixture was filtered
3. customthe filtrate was evaporated in vacuo
4. dissolutionThe residue was dissolved in ether
5. washwashed with aqueous saturated sodium bicarbonate solution
6. dry with materialdried with anhydrous magnesium sulfate
7. filtrationfiltered
8. customevaporated in vacuo