反应详情

118 g (0.058 mol) of 3-allyl-4-hydroxy-cinnamic acid are dissolved in 580 ml of 2 N sodium hydroxide solution, 800 g of ice are added and 120 g (1.16 mols) of acetic anhydride are introduced dropwise over the course of 15 minutes at 0°-5°C, whilst stirring. The crystals which have precipitated are then separated off, suction-dried and recrystallised from ethyl acetate. 3-Allyl-4-acetoxy-cinnamic acid of melting point 143°-144°C is thus obtained.

1. customThe crystals which have precipitated
2. customare then separated off
3. customsuction-dried
4. customrecrystallised from ethyl acetate