Research Article
Heterogeneous Catalysts in Pictet-Spengler-Type Reactions
Table 1
The aforementioned solids’ specific area and acidity.
| Entry | Solid | Surface area (m2/g) | Acidity (mmol NH3/100 g) |
| 1 | B | 50 | 21.6 | 2 | Ca-B | 48 | 21.1 | 3 | H-B | 82 | 30.9 | 4 | AlPB | 139 | 29.0 | 5 | AlZrPV | 208 | 36.7 | 6 | MO | 246 | 17.8 |
|
|