Catalytic Ionic Hydrogenation of Ketones by {[Cp*Ru(CO)2]2(μ-H)}+
{[Cp*Ru(CO)2]2(μ-H)}+OTf – functions as a homogeneous catalyst precursor for hydrogenation of ketones to alcohols, with hydrogenations at 1 mol % catalyst loading at 90 °C under H2 (820 psi) proceeding to completion and providing >90% yields. Hydrogenation of methyl levulinate generates γ-valerolactone, presumably by ring-closing of the initially formed alcohol with the methyl ester. Experiments in neat Et2C=O show that the catalyst loading can be <0.1 mole %, and that at least 1200 turnovers of the catalyst can be obtained. These reactions are proposed to proceed by an ionic hydrogenation pathway, with the highly acidic dihydrogen complex [Cp*Ru(CO)2(η2-H2)]+OTf- being formed under the reaction conditions from reaction of H2 with {[Cp*Ru(CO)2]2(μ-H)}+OTf –.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 972519
- Report Number(s):
- PNNL-SA-69639; KC0302010
- Journal Information:
- Organometallics, Journal Name: Organometallics Journal Issue: 4 Vol. 29; ISSN ORGND7; ISSN 0276-7333
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
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