Table 4. Control experiments highlighting a putative radical pathway.
| ||
Entry | Variation from above | % 2a a |
1 | None | 90 |
2 | BHT (1.1 equiv.) added | 70 |
3 | Catechol (1.1 equiv.) added | 29 |
4 | TEMPO (1.1 equiv.) added | 0 |
aAs measurd by 1H NMR analysis of crude product mixture using an internal standard.