Optimization of the solvent on the condensation of dimedone, benzaldehyde, and 4-hydroxycoumarin using a green LED (25 W)^a.

Entry	WO3/ZnO@NH2-EY (g)	Solvent	Time (min)	Yield (%)
1	0.03	—	45	97
2	0.03	H2O	180	45
3	0.03	Toluene	180	62
4	0.03	Ethanol	180	77
5	0.03	CH3CN	180	95

^aReaction conditions are described below Table 1. 3 mL solvent was used.