| Compound |
17 |
18 |
19 |
20 |
21 |
| Catalyst |
|
|
|
|
|
| Conventional Heating (without catalyst) |
22 (14.30 h)a
|
26 (15 h)a |
20 (15 h)a |
23 (13 h)a |
25 (13.30 h)a |
| 3°A Zeolite |
69 (6 h)a |
65 (5.30 h)a |
60(5 h)a |
60 (6.30 h)a |
62 (6 h)a |
aThe values inside the brackets indicate the reaction times for the formation of the
products |