Table 1 The reaction in solvent-free condition at room temperature
From: Zirconia-based catalyst for the one-pot synthesis of coumarin through Pechmann reaction
Entry | Reactant | Catalyst | Temperature (°C) | Time (min.) | %Yield | M.P. |
|---|---|---|---|---|---|---|
1 | Resarcinol + ethylacetoacetate | ZrO2-TiO2 | R.T. | 180 | 97 | 184–187 |
2 | Resarcinol + ethylacetoacetate | ZrO2-ZnO | R.T. | 240 | 63 | 184–187 |
3 | Resarcinol + ethylacetoacetate | ZrO2/cellulose | R.T. | 180 | N.R. | – |
4 | Catechole + ethylacetoacetate | ZrO2-TiO2 | 80 | 240 min | 55 | |
5 | O-nitrophenol + ethylacetoacetate | ZrO2-TiO2 | 80 | 240 | N.R. | |
6 | Resarcinol + ethylacetoacetate | Without catalyst | 80 | 240 | N.R. | – |