Catalysis of Cycloaddition of Carbon Dioxide and Epoxides Using a Bifunctional Schiff Base Iron(III) Catalyst

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Cyclic carbonates are solvents with high boiling points and low
toxicity. For synthesis of cyclic carbonates we report on bifunc-
tional Schiff base iron(III) complex for catalytic coupling re-
action of propylene oxide and CO2. Due to the presence of two
imidazole groups in the ligand framework it facilitates the cou-
pling reaction in the absence of co-catalyst with good activity
reaching TON value 225 within 4 h. Among various solvents
used, the catalyst gives the highest activity in dichloromethane.
Moreover, the complex catalyses also the cycloaddition re-
actions of CO2 and epichlorohydrin, styrene, 1-hexene and cy-
clohexene oxides. The iron catalysed coupling reaction was fol-
lowed with in situ infrared spectroscopy giving an apparent first order reaction (n=1) towards catalyst concentration. Accordingly, a monomolecular mechanism involving imidazole carbamate is proposed.
Sidor (från-till)545–548
Antal sidor4
StatusPublicerad - mar 2016
MoE-publikationstypA1 Tidskriftsartikel-refererad


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