POLYETHYLENEIMINE (PEI) ON SILICA AS CATALYST IN KNOEVENAGEL AND MICHAEL REACTIONS

Abstract

After the synthesis of polyethylenimine supported on silica, it has been used as a new and efficient catalyst in Knoevenagel and Michael condensations. The presence of the polyethylenimine in the catalytic system together with silica displays an acido-basic character allows a better catalytic activity in the condensations. Carried out under microwave irradiation, without organic solvent and during short time, the syntheses are respectful towards green chemistry. The solid catalyst can be easily reused. This catalyst has the acido-basic character at the same time.

Keywords

• catalyst
• Knoevenagel
• Michael
• polyethylenimine
• silica