A heterogeneous bifunctional silica-supported Ag2O/Im+/Cl- catalyst for efficient CO2conversion
A heterogeneous bifunctional silica-supported Ag2O/Im+/Cl- catalyst for efficient CO2conversion
复制标题
一种用于高效 CO2 转化的非均相双功能二氧化硅负载 Ag2O/Im /Cl- 催化剂
DOI：
10.1039/d2cy00194b
复制
发表时间：
2022
影响因子：
5
通讯作者：
Namba Kosuke
中科院分区：
文献类型：
--
作者：
Karanjit Sangita;Tanaka Emiko;Shrestha Lok Kumar;Nakayama Atsushi;Ariga Katsuhiko;Namba Kosuke
以咪唑盐（Im+Cl−@SiO2）为活化剂，制备了一种二氧化硅负载的双功能多相催化体系。Im+Cl−@SiO2通过在环境条件下有效利用CO2来活化用于醇的羧化环化反应的银催化剂和底物。该催化剂非常稳定，用途广泛，可以在不需要保护气氛的情况下储存。我们还证实了催化剂的可重复使用性高达五个周期。我们的催化体系不仅对炔丙醇/胺与CO2的双组分反应表现得很好，而且对炔丙醇、CO2和其他醇/胺的三组分反应也表现得很好，在温和的反应条件下，相应的碳酸酯和氨基甲酸酯的产率都很高。该体系兼有铵盐均相和多相催化的优点，具有活性好、产物易分离、催化剂易回收等优点。
A silica-supported bifunctional heterogeneous catalytic system was developed based on imidazolium salt (Im+Cl−@SiO2) as an activator. The Im+Cl−@SiO2 activated both the Ag-catalyst and substrate for the carboxylative cyclization reaction of alcohols by the efficient utilization of CO2 under ambient conditions. The catalyst is quite stable and versatile and could be stored without the need of a protective atmosphere. We also confirmed the reusability of the catalyst up to five cycles. Our catalytic system performed very well not only for the two-component reaction of propargyl alcohols/amines with CO2, but also for the three-component reaction of propargyl alcohols, CO2, and other alcohols/amines with excellent yields of the corresponding carbonates and carbamates under mild reaction conditions. This system secures the advantages of both homogeneous and heterogeneous catalysis of ammonium salts with good activity, as well as easy isolation of the product and easy recovery of the catalyst.