Table 5.
| |||
---|---|---|---|
entry | conditions | conversion (%)a | yield (%)a |
1 | X = Br, no additive | 100 | 77 |
2 | X = I, no additive | 100 | 48 |
3 | X = Br, with 10 mol % dinitrobenzene | <2 | <2 |
4 | X = I, with 10 mol % dinitrobenzene | 100 | 78 |
5 | X = Br, with 1 equiv TEMPO | 31 | <2 |
6 | X = I, with 1 equiv TEMPO | 100 | 55 |
Determined by 1H NMR spectroscopy using 1,3,5-trimethoxybenzene as internal standard. For details regarding the distribution of minor regioisomers, see Supporting Information.