| ||
|---|---|---|
| Entry | Catalyst | % yieldb (time) |
| 1 | 1 | 82 ± 7 (5 h) |
| 2 | 1/without irradiation | — |
| 3 | None | 14 ± 6 (5 h) |
| 4 | 2 | 36 ± 13 (30 min) |
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