Table 3

Entry	Catalyst	Time (min)	Yield (%)^b
Entry	Catalyst	Time (min)	Product (I)	Product (II)
1	N-sulfonic acid poly(4-vinylpyridinium) chloride (NSPVPC)	120	48	52
2	N-sulfonic acid poly(4-vinylpyridinium) hydrogen sulfate (NSPVPHS)	15	0	94

^aReaction conditions: 4-chloro-benzaldehyde, 1.0 mmol; 2-naphthol 2.0 mmol; NSPVPC or NSPVPHS catalyst, 10 mg; 60 °C and under solvent-free conditions
^b Isolated yield.

Table 3: The effect of exchange anion chloride with hydrogen sulfate on the synthesis of 14-(4-chlorophenyl)-14H-dibenzo [a,j]xanthene^a.