Table 5. Influence of Organic Solvents on the Ratio of Byproducts in the Hydrogenation of PPNa.
| composition
of byproduct |
||||||
|---|---|---|---|---|---|---|
| no. | organic solvents | PPN (%) | TPPA (%) | BPPA (%) | PPAL (%) | PPOH (%) |
| 1 | dichloromethane | 31.1 | 66.5 | 0 | 0.8 | 1.6 |
| 2 | hexane | 51.6 | 28.0 | 0 | 18.5 | 1.9 |
| 3 | toluene | 49.6 | 38.2 | 0 | 7.5 | 4.7 |
| 4 | tert-butyl methyl ether | 25.4 | 69.3 | 0 | 0.9 | 4.4 |
| 5 | ethyl acetate | 22.8 | 68.6 | 0 | 0 | 8.6 |
a
Conditions: 5.0 g (38.2 mmol) PPN, 1.5 g 10% Pd/C (Selcat Q) catalyst, 250 mL water and 50 mL organic solvent, 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.