Comparison of catalytic activity of Cu-isatin Schiff base-γ-Fe2O3 with some reported catalysts for the auto-hydrogen transfer reactions of alcohols with nitro compounds.
| Entry (ref.) | Catalyst (mol%) | Reaction conditions | Time (h) | Yield (%) |
|---|---|---|---|---|
| 1 (ref. 10a) | Pd/HTa (2) | Toluene, 130 °C | 24 | 35–93 |
| 2 (ref. 11) | Ag-MCP-1b (25 mg) | Toluene, K2CO3, glycerol, 120 °C | 12 | 70–99 |
| 3 (ref. 24) | Rh/Au (0.5) | Benzyl alcohol (solvent), Cs2CO3, 100 °C | 22 | 57 |
| 4 (ref. 25) | Co–N–C/CNT@ACc (0.4 g) | Solvent free, N2 atmosphere, 160 °C | 18–42 | 12–100 |
| 5 (ref. 26) | IrIII–AuI heterodimetallic complex (1) | Benzyl alcohol (solvent), Cs2CO3, 100 °C, aerobic condition | 15–22 | 4–99 |
| 6 (ref. 14) | CoOX@NC-800d (10) | Toluene, tBuOK, 120 °C | 15 | 57–87 |
| 7 (ref. 12) | Ir–Pd heterodimetallic catalyst (2) | Benzyl alcohol (solvent), Cs2CO3, 110 °C | 3–20 | 16–92 |
| 8 (ref. 15) | CuO–Fe3O4 (1.3) | Toluene, NaOH, 130 °C | 3 d | 58–84 |
| 9 (ref. 10b) | Pd/DNA (2.9) | Water, LiOH·H2O, 50 °C, N2 balloon | 24 | 51–95 |
| 10 (ref. 13) | Au/Ag–Mo-NRe (40 mg) | Toluene, K2CO3, glycerol, Ar, 120 °C | 24 | 60–98 |
| 11 (ref. 9) | RuCl3 (3) | K2CO3, glycerol, N2 atmosphere | 24 | 72–99 |
| 12 (This work) | Cu-isatin Schiff base-γ-Fe2O3 (1) | Solvent-free, KOH, 100 °C | 8–14 | 65–92 |
a
Hydrotalcite.
b
Polyacrylic acid.
c
Co, N and C composite encapsulated carbon nanotube grown in situ on the surface of activated carbon.
d
Cobalt nanoparticles modified with N-doped hierarchical porous carbon derived from biomass.
e
Au/Ag–Mo nano-rods.