Table 4.
Effect of acid or base.
 | ||
|---|---|---|
| entry | additive | NMR yield (%) |
| 1 | None | 78 |
| 2 | acetic acid (2 equiv) | 0 |
| 3 | 2,6-di-tert-butyl-4-methylpyridine (2 equiv) | 96 |
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