Chemical fixation of CO 2 with highly efficient ZnCl 2/[BMIm]Br catalyst system

Tetrahedron Letters

Volumn 45, Issue 45, 2004, Pages 8307-8310

  Li, Fuwei ^a   Xiao, Linfei ^a   Xia, Chungu ^a   Hu, Bin ^a  

^a LANZHOU INSTITUTE OF CHEMICAL PHYSICS   (China)

Author keywords

Catalyst reused; Chemical fixation of CO 2; Epoxide; Pure cis cyclic carbonate of cyclohexene oxide; ZnCl 2 BMIm Br

Indexed keywords

BROMINE; CARBON DIOXIDE; CARBONIC ACID DERIVATIVE; CYCLOHEXANE OXIDE; EPOXIDE; ORGANIC SOLVENT; ZINC CHLORIDE;

ARTICLE; CATALYSIS; CATALYST; CHEMICAL REACTION; GAS CHROMATOGRAPHY; MASS SPECTROMETRY; PROTON NUCLEAR MAGNETIC RESONANCE;

EID: 5144234681     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2004.09.074     Document Type: Article

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20. 2 (6.8 mg, 0.05 mmol), [BMIm]Br (65 mg, 0.3 mmol). The reaction vessel was then heated to 100°C for 1 h under a constant pressure (1.5 MPa) of carbon dioxide. Once the reaction is completed, the vessel was cooled to ambient temperature and the pressure released, then the contents were transferred to a round-bottom flask. Unreacted substrate was removed in a vacuum first, then the product was obtained. When about 1 ml of the reaction mixture was left the distillation was stopped and the last mixture was used as a catalyst to begin the fresh reaction. The catalyst could be reused five times almost without losing its catalytic activity. According to the GC-MS and NMR, the selectivity to the cyclic carbonates are >98%