反应详情

A mixture of ethyl-3-allyl-4-hydroxybenzoate (4.12 g), palladium on carbon (10% w/w) and ethanol (100 ml) was stirred under an atmosphere of hydrogen until 500 ml of hydrogen had been consumed. The mixture was filtered and the filtrate was evaporated. The residue was purified by flash chromatography on silica gel using 4:1 (v/v) n-pentane/ethyl acetate as eluent to give ethyl-3-propyl-4-hydroxybenzoate (4.8 g) as a solid, m.p. 78°-79° C.; microanalysis, found: C, 69.2; H, 8.1%; C12H16O3 requires: C, 69.2; H, 7.74%; NMR (CDCl3): 0.97(3H,t), 1.38(3H,t), 1.67(2H,m), 2.60(2H,t), 4.35(2H,q), 5.71(1H,s), 6.79(1H,d) and 7.75-7.87(2H,m); m/z 209(M+H).

1. customhad been consumed
2. filtrationThe mixture was filtered
3. customthe filtrate was evaporated
4. customThe residue was purified by flash chromatography on silica gel using 4:1 (v/v) n-pentane/ethyl acetate as eluent