Synthesis of 14-Aryl-14H-dibenzo[a,j]xanthene Derivatives Using H-Zeolite A as an Efficient and Reusable Catalyst under Solvent-Free Condition

Table 2

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

Entry	Catalyst (g)	Solvent	Time (min)	Temp (°C)	Yield (%)
1	0.01	Solvent-free	35	100	54
2	0.02	Solvent-free	30	100	66
3	0.03	Solvent-free	25	100	79
4	0.04	Solvent-free	20	100	84
5	0.05	Solvent-free	15	100	95
6	0.06	Solvent-free	15	100	95