Abstract
Kinetic terms for product formation in selection processes are evaluated for the example of asymmetric hydrogenation. The investigated models are characterized by preceding intermolecular equilibria to 2–4 stereoisomeric substrate complexes as well as direct intramolecular interconversion between corresponding diastereomeric intermediates. In the case of isobaric conditions the gross-hydrogen consumption can be described in each case by an equation analogous to simple Michaelis-Menten-type kinetics. The interpretation of the resulting constants is briefly demonstrated for a few practical examples. The temperature dependence of the enantiomeric ratio for the resulting products, as for example for a selection process, is also considered for the investigated models.
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