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. 2017 Feb 24;7:42975. doi: 10.1038/srep42975

Table 5. Synthesis of 14H-dibenzo [a. j] xanthene using different amount of catalystsa.

Entry Amount of catalyst (mg) Time (min)/% yieldb
1. Nil 60/nil
2. 5 30/60
3. 10 20/90
4. 15 15/92
5. 20 10/98

aReaction conditions: 2-naphthol (2 mmol) and benzaldehyde (1 mmol). bIsolated yield.