Centro de Química Estrutural and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
School of Chemistry and Chemical Engineering, Queen's University Belfast David Keir Building, Stranmillis Road, Belfast, Northern Ireland BT9 5AG, UK.
Molecules. 2021 Feb 19;26(4):1089. doi: 10.3390/molecules26041089.
The production of cyclic carbonates from CO cycloaddition to epoxides, using the C-scorpionate iron(II) complex [FeCl{κ-HC(pz)}] (pz = 1-pyrazol-1-yl) as a catalyst, is achieved in excellent yields (up to 98%) in a tailor-made ionic liquid (IL) medium under mild conditions (80 °C; 1-8 bar). A favorable synergistic catalytic effect was found in the [FeCl{κ-HC(pz)}]/IL system. Notably, in addition to exhibiting remarkable activity, the catalyst is stable during ten consecutive cycles, the first decrease (11%) on the cyclic carbonate yield being observed during the 11th cycle. The use of C-scorpionate complexes in ionic liquids to afford cyclic carbonates is presented herein for the first time.
用 C-螺环配体铁(II)配合物 [FeCl{κ-HC(pz)}]（pz = 1-吡唑-1-基）作为催化剂，通过 CO 与环氧化物的环加成反应，在定制的离子液体（IL）介质中，在温和条件（80°C；1-8 巴）下可高产率（高达 98%）得到环状碳酸酯。在 [FeCl{κ-HC(pz)}]/IL 体系中发现了有利的协同催化作用。值得注意的是，该催化剂不仅具有显著的活性，而且在十个连续循环中保持稳定，在第十一个循环中观察到环状碳酸酯产率首次下降（11%）。本文首次提出了在离子液体中使用 C-螺环配体配合物来制备环状碳酸酯。
