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Abstract
Cycloaddition-reactions are well suited for the study of pressure effects on reaction rates in liquid phase. To verify a functional relationship between the rate coefficient k and pressure, very precise kinetic data in small pressure increments are necessary. Kinetic measurements of Diels-Alder-reactions are presented; the pressure dependence of k is characterized by several hundred data points per 100 MPa-interval. Experiments are carried out in a multicell autoclave using UV/VIS-fibre-optic- spectroscopy and transient pressure control technique.
Description of experimental results by the theory of compression of reaction sphere, which was confirmed in previous measurements of polar reactions, shows good agreement between measurement and theory for the presented nonpolar reaction.