TABLE 3.
Brief comparison between the present study and previous reports.
| Catalyst | Cat. amount | Time (min) | Temp. (°C) | Solvent | No. of derivatives | Reference |
|---|---|---|---|---|---|---|
| CAN | 5 mol% | 30 | 120 | Solvent-free | 14 | Kumar et al. (2010) |
| Ruthenium/Yb(OTf)3 | 10 mol% | 16 h | 110 | Toluene | 22 | Wang et al. (2014) |
| Sulfated polyborate | 10 wt% | ∼8 | 100 | Solvent-free | 14 | Patil et al. (2017) |
| Boric acid | 20 mol% | 120 | 120 | Solvent-free | 11 | Karimi-Jaberi and Keshavarzi, (2010) |
| Br2-DABCO | 17 mol% | ∼70 | 110 | Solvent-free | 15 | Ghasemnejad-Bosra and Forouzani, (2011) |
| TaCl5 | 10 mol% | 60 | 100 | Solvent-free | 15 | Bhattacharya et al. (2009) |
| p-TSAM.W. | 50 mg | 5 | 185 | Solvent-free | 14 | Vaughan and Jha, (2009) |
| Sn(II)/nano silica | 10 mol% | 180 | 76 | Ethanol | 25 | This work |