Reversible Carbon Dioxide Binding by Simple Lewis Base Adducts with Electron-Rich Phosphines

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• 作者：Florenz Buß ; Paul Mehlmann ; Christian Mück-Lichtenfeld ; Klaus Bergander ; Fabian Dielmann
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：February 17, 2016
• 年：2016
• 卷：138
• 期：6
• 页码：1840-1843
• 全文大小：349K
• ISSN：1520-5126

文摘

For the efficient utilization of carbon dioxide as feedstock in chemical synthesis, low-energy-barrier CO₂ activation is a valuable tool. We report a metal-free approach to reversible CO₂ binding under mild conditions based on simple Lewis base adducts with electron-rich phosphines. Variable-temperature NMR studies and DFT calculations reveal almost thermoneutral CO₂ binding with low-energy barriers or stable CO₂ adduct formation depending on the phosphines donor ability. The most basic phosphine forms an air-stable CO₂ adduct that was used as phosphine transfer agent, providing a convenient access to transition-metal complexes with highly electron-rich phosphine ligands relevant to catalysis.