Summary
The hydrogenation of aldehydes and ketones with molecular hydrogen is catalyzed by Fe(CO)5 as catalyst precursor if a tertiary amine is used as solvent. The actual catalyst system is probably HFe(CO) −4 and the protonated amine. The amine also functions as a base and therefore more strongly basic amines like Et3N yield more active catalysts. Oxygen bases (even strong ones) furnish rather inefficient catalyst systems.
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Markó, L., Palágyi, J. Hydrogenation of aldehydes and ketones with molecular hydrogen using iron pentacarbonyl as catalyst precursor. Transition Met Chem 8, 207–209 (1983). https://doi.org/10.1007/BF00620690
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DOI: https://doi.org/10.1007/BF00620690