Green Energy & Environment (Dec 2022)

Dual-ionic imidazolium salts to promote synthesis of cyclic carbonates at atmospheric pressure

  • Tengfei Wang,
  • Danning Zheng,
  • Beibei An,
  • Yi Liu,
  • Tiegang Ren,
  • Hans Ågren,
  • Li Wang,
  • Jinglai Zhang,
  • Mårten S.G. Ahlquist

Journal volume & issue
Vol. 7, no. 6
pp. 1327 – 1339

Abstract

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Novel dual-ionic imidazolium salts are shown to display excellent catalytic activity for cycloaddition of carbon dioxide and epoxides under room temperature and atmospheric pressure (0.1 MPa) without any solvent and co-catalyst leading to 96.1% product yield. It can be reused five times to keep the product yield over 90%. These intriguing results are attributed to a new reaction mechanism, which is supported by theoretical calculations along with the measurements of 13C NMR spectrum and Fourier transform infrared spectroscopy (FT-IR). The excellent catalytic activity can be traced to a CO2-philic group along with an electrophilic hydrogen atom. Our work shows that incorporation of CO2-philic group is an feasible pathway to develop the new efficient ionic liquids.

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