Metalloporphyrins were immobilized on biogenous iron oxide (BIO) produced by iron-oxidizing bacteria, Leptothrix ochracea. These organic–inorganic hybrid materials were used as immobilized catalysts for the synthesis of cyclic carbonates from epoxides and CO2 under solvent-free conditions. ZnII porphyrin immobilized via four tetraalkylammonium bromide groups showed high catalytic activity and reusability at a catalyst loading of 0.1 mol%. The product was obtained in 99% yield after nine times reuse, and the substrate scope was broad.
金属
卟啉被固定在由
铁氧化菌Leptothrix ochracea产生的
生物氧化铁(BIO)上。这些有机-无机混合材料作为固定催化剂,用于在无溶剂条件下通过
环氧化物和
二氧化碳合成环状
碳酸盐。通过四个四烷基
铵溴化物基团固定的ZnII
卟啉显示出高催化活性和良好的重用性,在催化剂负载量为0.1 mol%的情况下,经过九次重复使用后,产物的产率达到了99%,而且底物范围广泛。