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"NMR Studies of the Kinetics of Homogeneously Catalyzed
Hydrogenations Using Parahydrogen Induced Polarization at Variable Pressure"
K. Woelk and J.
Bargon, Z. Phys. Chem. 182, 155-165 (1993).
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Quantitative evaluation of Parahydrogen Induced Polarization (PHIP) experiments
provides for the determination of kinetic data of homogeneously catalyzed
hydrogenations.
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Especially developed NMR probes facilitate investigations at reproducible
reaction conditions and constant hydrogenation rates.
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Rate equations, describing the experimentally achieved steady state kinetics,
are used to determine the pressure dependent ratio between free and complexed
catalyst in the reactive solution during the hydrogenation. A method is
presented to determine the rate constants of the catalytic cycle of such
hydrogenations, which follow the hydride route.
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K. Woelk, October
20, 1998