Knoevenagel Condensation of Aldehydes with Ethyl Cyanoacetate in Water Catalyzed by P4VP/Al₂O₃-SiO₂

Figure 3

Nitrogen adsorption-desorption isotherm at 77 K: (a) Al₂O₃-SiO₂(0.6) and (b) P4VP/Al₂O₃-SiO₂(0.6) (in situ).