A Cu-salen-based conjugated microporous polymer catalyst for -formylation of CO under mild conditions.

A heterogeneous salen-based conjugated microporous polymer catalyst (CMP@Cu-salen) is prepared by a one-pot method for -formylation of amines with CO. The uniformly dispersed Cu-salen site and porous structure facilitates the enrichment of CO and transfer of substrates and the transformation. Our CMP@Cu-salen shows excellent catalytic performance (conversion: 99%, selectivity: 90%) for formylation of -methylaniline under mild conditions (0.1 MPa, 40 °C), outperforming most existing heterogeneous catalysts. Additionally, it retains high catalytic activity even after three consecutive cycles. This work provides insight into the potential value of CMP@Cu-salen in CO conversion.