Table 2. Optimization of Solvent Type on the Proficiency of the Desired Condensation Reaction.

entry	ZnO-ZnS (g)	solvent	time (min)	yield (%)
1	0.01		180	83
2	0.01	water	180	42
3	0.01	toluene	180	68
4	0.01	ethanol	180	82
5	0.01	acetonitrile	30	87

Reaction conditions are described below Table 1. 5 mL of solvent was used in all cases.