Zirconia-based catalyst for the one-pot synthesis of coumarin through Pechmann reaction

Table 4 Effect of temperature in an ethanol solvent

Entry	Reactant	Catalyst	Temperature (°C)	%Yield	Time (min.)
1	Resarcinol + ethylacetoacetate	ZrO₂-TiO₂	100	97	20
2	Resarcinol + ethylacetoacetate	ZrO₂-TiO₂	80	95	50
3	Resarcinol + ethylacetoacetate	ZrO₂-TiO₂	60	92	150
4	Resarcinol + ethylacetoacetate	ZrO₂-TiO₂	45	80	160
5	Resarcinol + ethylacetoacetate	ZrO₂-ZnO	100	74	40
6	Resarcinol + ethylacetoacetate	ZrO₂-ZnO	80	67	60
7	Resarcinol + ethylacetoacetate	ZrO₂-ZnO	60	60	120
8	Resarcinol + ethylacetoacetate	ZrO₂-ZnO	45	43	150
9	Resarcinol + ethylacetoacetate	Without catalyst	80	N.R.	240