Support experiments for the proposed mechanism.
| Entry | Conditions | RSM of 5a | Yield of 5b |
|---|---|---|---|
| 1 | — | >99% | 0 |
| 2 | 10% CuCl | >99% | 0 |
| 3 | 15% TMEDA | >99% | 0 |
| 4 | 2.5 equiv. LiO t Bu | trace | >95% |
| 5 | 2.5 equvi. LiCl | 100% | 0 |
| Entry | Conditions | RSM of 5a | Yield of 5b |
|---|---|---|---|
| 1 | — | >99% | 0 |
| 2 | 10% CuCl | >99% | 0 |
| 3 | 15% TMEDA | >99% | 0 |
| 4 | 2.5 equiv. LiO t Bu | trace | >95% |
| 5 | 2.5 equvi. LiCl | 100% | 0 |