Catalytic effect of different hydroxyl-functionalised ionic liquids together with Zn(II) complex in the synthesis of cyclic carbonates from CO2

Ana B. Paninho, Andreia Forte, Malgorzata E. Zakrzewska, Kamran T. Mahmudov, Armando J. L. Pombeiro, M. Fátima C. Guedes da Silva, Manuel Nunes da Ponte, Luís C. Branco, Ana V. M. Nunes

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Quaternary ammonium salts bearing different alkyl chains and hydroxyl groups were synthesized and tested for the first time as co-catalysts in the cycloaddition reaction between CO2 and propylene oxide. Their synergetic catalytic effect together with the known tetranuclear zinc(II) complex [Zn43-OH)2 (1κO:2κO-HL)4(κO-HL)2(H2O)4] (1), H2L = 3-(2-carboxyphenyl-hydrazone)pentane-2,4-dione, was investigated at 60 °C and 4 MPa. Results obtained highlight the importance of exploring the hydrogen bonding effect via functionalization with hydroxyl groups but show that the length of the alkyl chains of the ammonium cation is a more relevant factor affecting the reaction kinetic for the system studied.

Original languageEnglish
Article number111292
JournalMolecular Catalysis
Volume499
DOIs
Publication statusPublished - Jan 2021

Keywords

  • arylhydrazones of B-diketones
  • catalysis
  • CO utilization
  • epoxides
  • ionic liquids
  • organic carbonates
  • propylene carbonate

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