Biphasic hydroformylation in new molten salts - Analogies and differences to organic solvents
Date
2002
Authors
Stenzel O.
Raubenheimer H.G.
Esterhuysen C.
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Abstract
New ionic compounds 1,2,3-trimethylimidazolium triflate (1) and 1-ethyl-2,3-dimethylimidazolium triflate (2) and (3-butylimidazole)triphenylboron (4) have been formed by alkylation and condensation reactions. An ion exchange reaction yielded the ionic compound 1-butyl-3-methylimidazolium tetraphenylborate (3). Molecular structures of all four compounds were determined by single crystal X-ray diffractometry. Utilizing two known rhodium complexes as catalyst precursors, compounds 1, 2 and 4 were used as solvents for biphasic hydroformylation reactions of two long chain 1-olefins. The results were compared to reactivities in the conventional solvent toluene in which similar turnover numbers but a higher tendency towards isomerization and hydrogenation occurred.
Description
Keywords
Alkylation, Catalysts, Hydrogenation, Ion exchange, Isomerization, Molecular structure, Organic solvents, Rhodium compounds, Toluene, X ray diffraction analysis, Hydroformylation reactions, Salts
Citation
Journal of the Chemical Society, Dalton Transactions
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