Table 4.
Effect of the amount of base on the Ireland–Claisen rearrangement of 1c in the presence of C6.
 | ||||
| Entry | Et3N (equiv) | C6 (mol %) | Yield of 3c (%) | syn/anti |
| 1 | 4.9 | 0 | 74 | 69:31 |
| 2 | 4.9 | 10 | 62 | 69:31 |
| 3 | 10 | 10 | 70 | 71:29 |
| 4 | 2.5 | 10 | 51 | 64:36 |
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