Table 7. Influence of the Amount of Catalyst (10% Pd/C) on the Ratio of Byproducts in the Hydrogenation of PPNa.
| composition
of byproduct |
||||||
|---|---|---|---|---|---|---|
| no. | catalyst/substrate ratio (g g–1) | PPN (%) | TPPA (%) | BPPA (%) | PPAL (%) | PPOH (%) |
| 1 | 0.30 | 31.1 | 66.5 | 0 | 0.8 | 1.6 |
| 2 | 0.25 | 32.8 | 65.8 | 0 | 0.5 | 0.9 |
| 3 | 0.20 | 47.5 | 49.5 | 0 | 0 | 3.0 |
| 4 | 0.15 | 52.6 | 45.0 | 0 | 0 | 2.4 |
| 5 | 0.10 | 55.5 | 40.8 | 0 | 0 | 3.7 |
a
Conditions: 5.0 g (38.2 mmol) PPN, 1.5 g 10% Pd/C (Selcat Q) catalyst, 250 mL water and 50 mL dichloromethane, 5.27 g NaH2PO4·H2O (38.2 mmol), and 3.82 g conc. H2SO4 (38.2 mmol), 80 °C, 6 bar, reaction time: 7 h.