A conjugated crosslinked polyazomethine containing pyridine units (PAM-Py) was prepared from two commercial monomers, 2,6-diaminopyridine and isophthaldehyde, under microwave heating in only 30 min. Taking advantage of its thermal and chemical stability, porosity (S BET of 192 m 2 /g), insolubility, and ability to coordinate metals through the pyridine or imine N atoms, ruthenium-, aluminum-, iron-, and cobalt-poly(azomethine-pyridine) complexes (PAM-PyM) were prepared. The resulting metal polymers were evaluated as heterogeneous catalysts for the cycloaddition of CO 2 to epoxides yielding selectively the corresponding cyclic carbonates. All heterogeneous catalysts showed an extraordinary effectiveness with very high yields of epoxide conversion (up to 98%), turnover numbers up to 7425, and were reused at least five times without loss in catalytic activity.
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