Table 3. Control Experimentsa.
| entry | catalyst | additive | conversion |
|---|---|---|---|
| 1 | precatalyst (1 mol %) | N.R | |
| 2 | preactivated catalyst II (1 mol %) | K2CO3 (10 mol %) | N.R. |
| 3 | HBArF.2Et2O (10 mol %) | complex mixture |
a
N.R = no reaction.
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