A novel basic polymerized ionic liquid (BPIL): polymeric 1-[(4-ethenylphenyl)methyl]-3propylimidazolium imidazolide was synthesized and characterized by fourier transform infrared (FT-IR), nuclear magnetic resonance (NMR) and electron spray ionization mass spectrometry (ESI-MS). The BPIL was used as an efficient catalyst for aqueous Knoevenagel condensations with extended substrates. In 10 comparison with common base catalyst, the BPIL showed high catalytic activity, which was ascribed to the cooperation between the strong basicity and high surface activity. Moreover, the BPIL with high molecular weight have high surface activity and low catalytic activity. In addition, the BPIL was easily recovered and maintain high catalytic activity after five cycles of use in the system using benzaldehyde and malononitrile as substrates.
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