Table 1: Effect of different solvents on the reaction between 4-chlorobenzaldehyde and 2-naphthol.

EntrySolventCatalyst (g)TimeYield (%)

1Ethanol0.0550 min67
2Methanol0.0550 min73
3CHCl30.0550 min64
4Solvent-free0.0515 min95