Table 3 Recoverability and reusability of the Co3O4@SiO2/OS-SO3H nanocatalyst.

From: Magnetic cobalt oxide supported organosilica-sulfonic acid as a powerful nanocatalyst for the synthesis of tetrahydrobenzo[a]xanthen-11-ones

Run

Time (min)

Yield (%)

Run

Time (min)

Yield (%)

1

40

95

5

45

93

2

40

95

6

50

91

3

40

95

7

55

87

4

45

95

8

65

84

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