Promoting effect of ionic liquids on ligand substitution reactions |
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| Authors: | Michael D. Sliger Rachel K. Traylor Sidney H. Young Norris W. Hoffman Robin D. Rogers |
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| Affiliation: | a Department of Chemistry and Center for Green Manufacturing, Box 870336, The University of Alabama, Tuscaloosa, AL 35487-0336, USA
b Department of Chemistry, University of South Alabama, Mobile, AL 36688, USA |
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| Abstract: | Ionic liquid solvents N-hexylpyridinium bistrifylimide ([C6pyr][Tf2N]] and 1-butyl-3-methylimidazolium hexafluorophosphate ([C4mim][PF6]) promoted the displacement of anionic ligands by pyridine derivatives in trans-(Ph3P)2Rh(CO)NO3 to a much greater extent than did dichloromethane. Thus, addition of a slight excess of 2-fluoropyridine to trans-(Ph3P)2Rh(CO)NO3 in [C4mim][PF6] gave a 29:71 product mixture of trans-(Ph3P)2Rh(CO)NO3:[trans-(Ph3P)2Rh(CO)(2-fluoropyridine)][NO3], while the ratio was 91:9 in dichloromethane. |
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| Keywords: | Ionic liquids Ligand substitution Rhodium Solvent properties |
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