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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

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BMC Chemistry

ISSN: 2661-801X

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