Table 2. Controlling regioselectivity in C–H carbonylation.
| |||||
| Entry | Acid | CO source | 4t, % | 5t, % | 4t/5t |
| 1 | 2a | 100% CO | 11 | 26 | 0.4 |
| 2 | 2b | 100% CO | 41 | 25 | 1.6 |
| 3 | 2a | 6.25% CO/Air | 36 | 23 | 1.6 |
| 4 | 2b | 6.25% CO/Air | 50 | 1.7 | 29 |
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