Table 4 Comparison of the catalytic activity of the Co–Ni/Fe3O4@MMSHS nanocatalyst with the other reported catalysts for the synthesis of 1-phenyl-1H-1,2,3,4-tetrazole (4a). aIsolated yield.

From: Cobalt–nickel supported on magnetic mesoporous silica hollow spheres for efficient synthesis of tetrazole derivatives under solvent-free conditions

Entry

Catalyst (conditions)

Time (min)

Yielda (%)

References

1

(Fe3O4@NFC@NSalophCu) CO2H (0.3 mol%; 6.5 mg, solvent-free, 80 °C)

30

98

62

2

Fe3O4@HT@AEPH2-Co(II) (0.005 g, H2O, 90 °C)

60

95

63

3

Cu/Pectin@Fe3O4 (0.5 mol%, solvent-free, 100 °C)

60

98

64

4

SiO2/boron sulfuric acid (BSA) (0.5 mol%, PEG, 120 °C)

360

89

65

5

HKUST-1 (Cu-BTC MOFs) (0.1 g, solvent-free, 120 °C)

120

90

66

6

Co–Ni/Fe3O4@MMSHS (0.006 g, Solvent-free, 80 °C)

6

98

This work

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