Entry | Cat. | Solvent | t/h | Yieldb/% |
1 | None | H2O | 6 | - |
2 | PWA | H2O | 6 | 82 |
3 | PMA | H2O | 6 | 98 |
4 | PMA | H2O | 8 | 98 |
5 | PMA | H2O | 4 | 98 |
6 | PMA | H2O | 3 | 91 |
7 | PMA | H2O | 2 | 84 |
8 | PMA (0.0075 g) | H2O | 4 | 98 |
9 | PMA (0.010 g) | H2O | 4 | 98 |
10 | PMA (0.0025 g) | H2O | 4 | 76 |
11 | PMA | H2O | 4 | 98c |