5 years ago

Poly(ethylene glycol)s as Ligands in Calcium-Catalyzed Cyclic Carbonate Synthesis

Poly(ethylene glycol)s as Ligands in Calcium-Catalyzed Cyclic Carbonate Synthesis
Thomas Werner, Johannes Steinbauer
Herein the use of CaI2 in combination with poly(ethylene glycol) dimethyl ether (PEG DME 500) as an efficient catalyst system for the addition of CO2 to epoxides is reported. This protocol is based on a nontoxic and abundant metal in conjunction with a polymeric ligand. Fifteen terminal epoxides were converted at room temperature to give the desired products in yields up to 99 %. Notably, this system was also effective for the synthesis of twelve challenging internal carbonates in yields up to 98 %. Ca-talysis: Calcium-based catalyst systems using inexpensive and biocompatible ligands for the synthesis of cyclic carbonates from epoxides and CO2 are reported. This scalable reaction protocol can be used for the synthesis of terminal carbonates at room temperature as well as for the synthesis of internal carbonates below 100 °C.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cssc.201700788

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