Table 3.
Optimization of the hydrolysis of vanillin acetate by KF/Al2O3.
| Methoda | Time (min) | Temp. (°C)c | Conv.b (%) | Yieldb (%) |
|---|---|---|---|---|
| Method E | 14.5 | 110 | 100 | 92 |
| Method E | 14.0 | 115 | 100 | 94 |
| Method E | 13.0 | 122 | 99.5 | 96 |
| Method F | 14 | 115 | 82 | 76 |
| Method F | 30 | 115 | 97 | 91 |
| Method F | 60 | 115 | 100 | 91 |
a Method E: The hydrolysis was assisted by microwave irradiation at 300 W; Method F: The hydrolysis was supported by conventional heating to 115 °C; b Conv. and yield were determined by GC/MS; c Temp. = temperature measured when the microwave irradiation was stopped (Method E); Temp. = oil bath temperature (Method F)