Table 7.
Diene 46 | R1 | R2 | Reaction time, h | Conversion, % | Yielda, % | ||||
45 | 49 | 50 | 51 | 52 | |||||
a | H | H | 6 | 82 | 4 | – | 13 | 31 | – |
b | H | Me | 2.5 | 83 | 36 | – | 12 | 13 | 33 |
c | H | Ph | 3.5 | 75 | 57 | 38 | 7 | 27 | – |
d | Me | Me | 3 | 84 | 51 | – | – | 31 | 26 |
aThe yields are given based on the converted dienes 46a–d.