Table 1 Bismuth nitrate pentahydrate-induced simple synthesis of vanillin from curcumin following Figure 1
From: Bismuth nitrate-induced microwave-assisted expeditious synthesis of vanillin from curcumin
Entry | Solid surface | Method/solvent | Yield (%) |
|---|---|---|---|
1 | Florisil | Dean-Stark/Benzene | NRa |
2 | Silica gel | Dean-Stark/Benzene | NR |
3 | Molecular sieves | Dean-Stark/Benzene | NR |
4 | KSF clay | Dean-Stark/Benzene | 10 |
5 | Neutral alumina | Dean-Stark/Benzene | NR |
6 | Florisil | Reflux/DCM | NR |
7 | Silica gel | Reflux/DCM | NR |
8 | Molecular sieves | Reflux/DCM | NR |
9 | KSF clay | Reflux/DCM | 34 |
10 | Neutral alumina | Reflux/DCM | 15 |
11 | Florisil | Dryb | NR |
12 | Silica gel | Dry | NR |
13 | Molecular sieves | Dry | NR |
14 | KSF clay | Dry | NR |
15 | Neutral alumina | Dry | NR |
16 | Florisil | Microwave/solvent free | 60 |
17 | Silica gel | Microwave/solvent free | 54 |
18 | Molecular sieves | Microwave/solvent free | 45 |
19 | KSF clay | Microwave/solvent free | 77 |
20 | Neutral alumina | Microwave/solvent free | 61 |
21 | Florisil | Reflux/Benzene | NR |
22 | Silica gel | Reflux/Benzene | NR |
23 | Molecular sieves | Reflux/Benzene | NR |
24 | KSF clay | Reflux/Benzene | NR |
25 | Neutral alumina | Reflux/Benzene | NR |