Entry | Brønsted acid (mol%) | Cobalt salt | Time/h | Yield/% | |
4 | 3 | ||||
1 | PhSO3H(10) | - | 2 | 0.7 | 89.4 |
2 | CH3SO3H(10) | - | 2 | 0.8 | 87.0 |
3 | CF3SO3H(10) | - | 2 | 2.5 | 79.9 |
4 | H3PO4(10) | - | 2 | 0.0 | 90.5 |
5 | H2SO4(10) | - | 2 | 1.6 | 86.5 |
6 | - | CoCl2 | 2 | 0.0 | 78.9 |
7 | - | Co(NO3)2∙6H2O | 2 | 0.0 | 98.0 |
8 | - | Co(ClO4)2∙6H2O | 2 | 1.1 | 95.9 |
9 | - | Co(BF4)2∙6H2O | 2 | 5.8 | 84.1 |
10 | PhSO3H(10) | CoCl2 | 2 | 25.0 | 56.7 |
11 | PhSO3H(10) | Co(NO3)2∙6H2O | 2 | 1.0 | 88.1 |
12 | PhSO3H(10) | Co(ClO4)2∙6H2O | 2 | 52.5 | 45.8 |
13 | PhSO3H(10) | Co(BF4)2∙6H2O | 2 | 46.7 | 44.8 |
14 | H3PO4(10) | Co(ClO4)2∙6H2O | 2 | 2.9 | 88.2 |
15 | H3PO4(10) | Co(BF4)2∙6H2O | 2 | 2.7 | 58.3 |
16 | CF3SO3H(10) | Co(ClO4)2∙6H2O | 2 | 51.5 | 30.1 |
17 | CF3SO3H(10) | Co(BF4)2∙6H2O | 2 | 78.7 | 10.8 |
18 | CH3SO3H(10) | Co(ClO4)2∙6H2O | 2 | 63.1 | 26.7 |
19 | CH3SO3H(10) | Co(BF4)2∙6H2O | 2 | 52.2 | 28.1 |
20 | H2SO4(10) | Co(ClO4)2∙6H2O | 2 | 18.9 | 64.8 |
21 | H2SO4(10) | Co(BF4)2∙6H2O | 2 | 32.9 | 61.2 |
22 | H2SO4(20) | Co(BF4)2∙6H2O | 24 | 76.0 | 19.6 |