Molybdate ionic liquids as halide-free catalysts for CO₂ fixation into epoxides

Abstract

Herein we describe the syntheses of a series of molybdate and polyoxomolybdate ionic liquids (ILs), their full spectroscopic characterisation (FT-IR, 1H-, 13C-, 31P- and 95Mo-NMR) and a comparison of their...

Facile One-Pot Preparation of Organotin-Oxometalate Polymers for Efficient Synthesis of Dimethyl Carbonate from CO2

“…However, when the pressure was continually increased to 11 MPa, the DMC yield decreased gradually. This could be explained from the increased solubility of CO 2 in the liquid phase with increasing CO 2 pressure. − At the same time, when the pressure was too high, CO 2 may liquify and dissolve each other with raw material CH 3 OH, which diluted the concentration of the reactants and catalyst and reduced the interaction between the active site of the catalyst and CH 3 OH.…”

A Combined Experimental/Computational Study of Dicationic Ionic Liquids with Bromide and Tungstate Anions

“…Considering the good CO 2 activation potential that emerged from the computational study on the proposed tungstate DILs, compounds 4-6 (and their parent bromide DILs 1-3) were tested as catalysts for the cycloaddition of CO 2 to epoxides (CCE reaction) (Scheme 3). Epichlorohydrin was chosen as the substrate due to its widespread use as a benchmark epoxide and the consequent possibility of comparing it with the results in the literature [51]. The reactions were performed with a CO 2 pressure of 10 bar, a catalyst load of 1 mol%, a reaction time of 2 h, and temperatures of 80 systems both using a small anion (as the bromide) and a heavy anion (as the tungstate) and the interactions between them and other molecules.…”

“…In parallel, the inclusion of catalytically or electrochemically active metalbased systems in ILs structures is attracting growing interest due to the flexibility and good potentialities of this approach [48][49][50]. Bragato et al and Calmanti et al respectively reported the use of molybdate and tungstate-based ILs as effective catalysts for the cycloaddition of CO 2 to epoxides [51,52]. Other authors have also reported encouraging results concerning the use of tungstate-based ILs for the catalysis reaction of CO 2 with substrates like diamines, propargylic amines, aminophenols, aminothiobenzenes, and cyanoanilines for the preparation of corresponding cyclocarbonated compounds [53][54][55][56][57] or for the conversion of cyclic carbonates into linear ones [58].…”

“…In parallel, the inclusion of catalytically or electrochemically active metal-based systems in ILs structures is attracting growing interest due to the flexibility and good potentialities of this approach [48][49][50]. Bragato et al and Calmanti et al respectively reported the use of molybdate and tungstate-based ILs as effective catalysts for the cycloaddition of CO2 to epoxides [51,52].…”