Table 28.
Results of the rearrangement of endoperoxides 541a–d.
 | |||||
| Compound | R1 | R2 | Ar | Yield of 542, % | Yield of 543,% |
| a | Et | Et | Ph | 88 | traces |
| b | Et | Et | 4-Br-C6H4 | 92 | traces |
| c | Ph | Ph | 4-Br-C6H4 | 93 | traces |
| d | Me | H | Ph | 0 | 87 |
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