Optimisation of catalyst. Yields were determined by 19F NMR analysis using 1-bromo-4-fluorobenzene as an internal standard.
| ||
|---|---|---|
| Entry | [Ru] | 3aa (yield%) |
| 1a | Ru(p-cymene)(CO2Mes)2 | 81 |
| 2b | Ru(p-cymene)(CO2Mes)2 | 60 |
| 3 | Ru(p-cymene)(CO2Mes)2 | 86 |
| 4 | [Ru(tBuCN)6][BF4]2 | 0 |
| 5 | [Ru(C6H6)(OPiv)2] | 25 |
| 6 | [Ru(C 6 Me 6 )(OAc) 2 ] | 93 |
Without LiOAc and AcOH.
Without AcOH.