| Conditions | Reaction time/min | Yield/% | ||
| Carbazole | Dibenzofuran | Benzothiophene | ||
| Microwave | 4 | 26.4 | 27.7 | 30.4 |
| 10 | 32.9 | 34.3 | 32.9 | |
| Conventional | 120 | 36.9 | 37.6 | 38.5 |