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Table 3 Comparison of the efficiency of catalysts reported for the synthesis of 14-(4-nitrophenyl)-14H-dibenzo [a, j] xanthenes and SmCl3

From: A highly efficient green synthesis of 1, 8-dioxo-octahydroxanthenes

Entry Catalyst Mol % Time (min/h) Yield (%) Ref.
1 NaHSO4-SiO2 10 7.5 h 91 [18]
2 TBAHS 10 3.5 h 94 [39]
3 DABCO-Br 10 2.5 h 90 [41]
4 KAl(SO4)2.12H2O 50 4.0 h 90 [19]
5 EPZ 10 10 3.0 h 95 [42]
6 Yb(OTf)3/[BPy]BF4 1/2 mL 5.0 h 89 [25]
7 ZnO-CH3COCl 30 16.0 h 96 [43]
8 LiBr 15 1.0 h 84 [17]
9 Sulfamic acid 10 11.0 h 94 [15]
10 SmCl3 20 8.0 h 98 This paper