Table 1. Comparison of Catalytic Performance of Different Rh/SiO2 Systems for the Hydrogenation of 5a.
| catalyst | Rh amount [wt %] | yield of 6 [%] (d. r.) | yield of 7 [%] |
|---|---|---|---|
| Rh–CAAC 1/SiO2 | 1.0 | 90 (94:6) | 3 |
| Rh–CAAC 1/SiO2 | 5.1 | 86 (94:6) | 4 |
| Rh/SiO24a | 1.0 | 89 (94:6) | 3 |
| Rh/SiO24e | 0.87 | 66 (87:13) | 18 |
| Rh/SiO24f | 5.1 | 59 (89:11) | 23 |
| Rh/SiO24g | 9.9 | 68 (88:12) | 23 |
a
Yields were determined via GC-FID against mesitylene as internal standard. Numbers do not add up to unity, because cyclohexane and cyclohexanol are formed as byproducts, which coelute with the solvent and thus cannot be detected.