反应详情

1.0 eq. of 3,4,5-trifluorobenzaldehyde is dissolved in DMF and stirred at room temperature with 1.1 eq. of ethyl 2-(triphenylphosphanylidene)propionate until complete conversion can be determined by means of thin-layer chromatography. The mixture is freed from the solvent and the residue is stirred in diisopropyl ether. The insoluble residue is filtered off, the filtrate is concentrated in vacuo and the residue is chromatographed on silica gel (EA/heptane 1:1), the title compound being obtained in the form of a colorless solid. (M.p.: 66-68° C.).

1. filtrationThe insoluble residue is filtered off
2. concentrationthe filtrate is concentrated in vacuo
3. customthe residue is chromatographed on silica gel (EA/heptane 1:1)