反应详情

An aqueous solution (750 ml) of 85 g of NaClO2 and 90 g of NaH2PO4 is added dropwise with cooling and stirring to 120 g of 4-benzyloxy-2-ethylbenzaldehyde, dissolved in 1 l of DMSO, during which the temperature should not rise above 35° C. The mixture is stirred at RT for a further 3 h, and the precipitate formed is filtered off with suction. The solid is then dissolved in 600 ml of EtOAc, dried and re-evaporated. The residue is crystallised from (Me2CH)2O, giving 4-benzyloxy-2-ethylbenzoic acid; yield 96.2 g (75%); m.p. 132-133°.

1. temperaturewith cooling
2. customrise above 35° C
3. customthe precipitate formed
4. filtrationis filtered off with suction
5. dissolutionThe solid is then dissolved in 600 ml of EtOAc
6. customdried
7. customre-evaporated
8. customThe residue is crystallised from (Me2CH)2O