Highly Active and Robust Metalloporphyrin Catalysts for the Synthesis of Cyclic Carbonates from a Broad Range of Epoxides and Carbon Dioxide
作者:Chihiro Maeda、Junta Shimonishi、Ray Miyazaki、Jun-ya Hasegawa、Tadashi Ema
DOI:10.1002/chem.201600164
日期:2016.5.4
metalloporphyrins with quaternary ammonium bromides (nucleophiles) at the meta, para, or ortho positions of meso‐phenyl groups were synthesized as catalysts for the formation of cyclic carbonates from epoxides and carbon dioxide under solvent‐free conditions. The meta‐substituted catalysts exhibited high catalytic performance, whereas the para‐ and ortho‐substituted catalysts showed moderate and low activity
合成了在中间-苯基的间位,对位或邻位带有溴化季铵盐(亲核试剂)的双功能金属卟啉,作为在无溶剂条件下由环氧化物和二氧化碳形成环状碳酸酯的催化剂。该元取代的催化剂表现出较高的催化性能,而对-和邻位取代的催化剂分别表现出中等和低活性。DFT计算显示的优势起源元取代的催化剂,这可能会在使用中灵活的季铵阳离子元稳定催化过程中产生的各种阴离子的位置。锌(II)卟啉八个亲核体在间位位置显示出非常高的催化活性(转换数(TON)= 240 000在120℃下,转化频率(TOF)= 31 500 H机床-1在170℃下)在初始CO 2压力为1.7 MPa;即使在环境温度(20°C)的大气压CO 2压力(气球)下也能催化反应;并适用于广泛的基材,包括末端和内部环氧化物。