Iron(II) Bis-CNN Pincer Complex-Catalyzed Cyclic Carbonate Synthesis at Room Temperature,ACS Sustainable Chemistry & Engineering

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Iron(II) Bis-CNN Pincer Complex-Catalyzed Cyclic Carbonate Synthesis at Room Temperature
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-09-20 00:00:00 , DOI: 10.1021/acssuschemeng.7b01990
Fei Chen ₁ , Ning Liu ₁ , Bin Dai ₁

Affiliation

A series of unsymmetrical pyridine-bridged bis-pincer-type iron(II) complexes were synthesized, and the complexes were used as catalysts for the cycloaddition of CO₂ and epoxides. At ambient temperature, the combined use of iron complexes and tetrabutyl ammonium bromide (TBAB) resulted in an efficient catalytic system for the synthesis of cyclic carbonates under low CO₂ pressure (0.5 MPa) and solvent-free conditions. More importantly, in the absence of TBAB, propylene oxide was also easily converted to the target products when the temperature was increased to 100 °C, and a turnover frequency (TOF) value of 7900 h^–1 was achieved at 120 °C. An elevated reaction temperature (80 °C) was required to achieve high conversion of challenging internal epoxides and oxetanes to their respective carbonates with good yields. Moreover, the iron catalyst can be easily recycled six times via simple filtration without any significant loss of activity.

中文翻译：

室温下铁（II）Bis-CNN钳式络合物催化的环状碳酸酯合成

合成了一系列不对称的吡啶桥联的双钳型铁（II）配合物，该配合物用作CO ₂和环氧化物的环加成催化剂。在环境温度下，铁配合物和四丁基溴化铵（TBAB）的组合使用可在低CO ₂压力（0.5 MPa）和无溶剂条件下形成高效的催化体系，用于合成环状碳酸酯。更重要的是，在没有TBAB的情况下，当温度升至100°C且周转频率（TOF）值为7900 h ^–1时，环氧丙烷也易于转化为目标产物。在120℃下达到。需要较高的反应温度（80°C）才能以高收率将具有挑战性的内部环氧化物和氧杂环丁烷高转化为它们各自的碳酸盐。此外，铁催化剂可以很容易地回收利用通过简单的过滤六次而没有任何小号活性ignificant损失。

更新日期：2017-09-20

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