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

EntryCatalyst (g)SolventTime (min)Temp (°C)Yield (%)

10.01Solvent-free3510054
20.02Solvent-free3010066
30.03Solvent-free2510079
40.04Solvent-free2010084
50.05Solvent-free1510095
60.06Solvent-free1510095