Table 1. RCM of 4 Promoted by Complex Ru8 upon Thermal or Light Activation.
entry | solvent | activation | time (h) | conversn (%) |
---|---|---|---|---|
1 | CD2Cl2 | none, 20 °C | 720 | <5 |
2 | CD2Cl2 | heat, reflux | 48 | <5 |
3 | CD2Cl2 | hν, 20 °C | 24 | 25 |
4 | C6D6 | none, 20 °C | 720 | <5 |
5 | C6D6 | heat, 80 °C | 7 | 29a |
6 | C6D6 | heat, 80 °C | 24 | 63a |
7 | C6D5CD3 | heat, 80 °C | 24 | 79 |
8 | C6D5CD3 | heat, 110 °C | 5 | 78 |
9 | C6D6 | hν, 20 °C | 12 | 73 |
The formation of a side product, namely the product resulting from cycloisomerization, was observed.