Table 3.
Results of the depolymerization of other lignins and sawdust.[a]
| Entry | Substrate | Lewis acid | Monomer yield [wt %] | |||||
|---|---|---|---|---|---|---|---|---|
| type | amt [mmol] | 8 a | 9 a | 8 b | 9 b | Sum[b] | ||
| 1 | BSP | Sc(OTf)3 | 0.120 | 1.7 | 0.7 | 0.4 | 0.8 | 5.2 |
| 2 | pine | Sc(OTf)3 | 0.120 | 5.1 | 0.0 | 0.6 | 0.0 | 6.8 |
| 3 | sawdust | Sc(OTf)3 | 0.120 | 2.1 | 1.4 | 0.7 | 2.9 | 9.8 |
| 4 | sawdust | Ga(OTf)3 | 0.120 | 2.4 | 1.6 | 0.3 | 1.4 | 7.1 |
| 5 | sawdust[c] | Yb(OTf)3 | 0.030 | 0.0 | 0.1 | 1.6 | 3.0 | 7.6 |
[a] Conditions: 300 mg lignin or 2.0 g poplar sawdust, 0.060 mmol [Rh(cod)Cl]2, 0.240 mmol dppp, acid; 175 °C, 2 h, 22 mL 1,4‐dioxane/water. [b] Sum of all identified monomers (see Tables S14–18 for complete listing). [c] 4 h reaction.