Research Article

Efficient Knoevenagel Condensation Reactions Catalyzed by Activated Gel Zirconium(IV) Oxide

Table 3

Effect of temperature.

EntryTemperature (°C)Yield ( % ) a

1035
2545
31048
41555
52060
62588
73575
84068

Reaction condition: 1a (1 mmol), 2 (1 mmol), ZrOCl2·8H2O/NaNH2 (15 mol %), in THF (5 mL).
a I solated yield.