Table 1.
Different manganese catalysts for the dehydrogenation of aqueous methanol.[a]
| Entry | Catalyst | V 5h [mL] | TON5h |
|---|---|---|---|
| 1[b] | 1 | 11 | 54 |
| 2 | 2 | – | – |
| 3[b] | 3 | 13 | 65 |
| 4 | 4 | – | – |
| 5 | 5 | 9 | 41 |
| 6 | 6 | – | – |
| 7 | [Mn2(CO)10] | – | – |
| 8[b] | [Mn(CO)5Br] + 10 equiv PNPiPr ligand | 14 | 68 |
[a] Reaction conditions: MeOH/H2O (5 mL, ratio 9:1), 8 m KOH (molarity based on total MeOH + H2O volume), catalyst (8.4 μmol, 1.68 mm); T set: 92 °C. Gas volumes were determined using manual or automatic gas burettes and were analyzed by GC. Each molecule of hydrogen is counted as one turnover. All gas measurements were performed at least twice and corrected by blank values. [b] Standard deviation is less than 15 %.