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| starting material | conversion (%) | epoxide | epoxide d.r. |
|---|---|---|---|
| 13a | 100 | (±)-17a | 2:1 |
| 13b | 100 | (±)-17b | 1:1 |
| 14a | 100 | (±)-18a | 2:1 |
| 14b | 100 | (±)-18b | 3.5:1 |
| 15a | 100 | (±)-19a | trans only |
| 15b | 100 | (±)-19b | trans only |
| 16a | 81 | (±)-20a | 4:1 |
| 16b | 80 | (±)-20b | 4:1 |
