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In situ ir spectroscopy in ionic liquids : Toward the detection of reactive intermediates in transition metal catalysis

In situ IR spectroscopy is used for the in situ investigation of the mechanisms of two selected reactions. The ReactIR proves to be a versatile tool for reaction monitoring and for the on-line collection of kinetic information. With this method, the direct alkylation of N-methylimidazole with 1-bromobutane can be shown to proceed via S N 1 or electron transfer rather than S N 2. For easy and straightforward detection and characterization of catalytically reactive intermediates in the Suzuki-Miyaura reaction, though, the method seems to be not sensitive enough, but it can help to gain insight into the reaction mechanism.