Abstract: Coumarin－3－ ethyl—carboxylate was synthesized with salicylaldehyde and diethylmalonate by using absolute alcohol as solvent and chitosan as catalyst. Some factors that influnced the yield of coumarin－3－ ethyl—carboxylate were studied. The results showed that the yield of coumarin－3－ ethyl—carboxylate was up to 87％ when diethylmalonate was 0.06 mol, salicylaldehyde was 0.05 mol, chitosan was 3.0 g, the reaction time was 120 min, and absolute alcohol was 10 mL, the temperature was 70 ℃.

Key words: Coumarin－3－ ethyl—carboxylate, salicylaldehyde, diethylmalonate, chitosan, synthesis, yield