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Abstract
Abstract The exchange reaction between propylene and deuterium was studied over alumina. The rate of the reaction was expressed by Vex=k[PD2]0.5[PPro]0.0. In the initial stages of the reaction the cis- and trans-1 -d1 species of propylene were the only products of the exchange reaction, but the concentration of the 3-d1 species increased continuously as the reaction progressed. The activation energy for the exchange reaction was about 8.2 kcal/mol. Propylene-cis-d1 was reacted over alumina, and the variation in the deuterium distribution of the propylene was followed by microwave spectroscopy. Isotope scrambling and “double-bond migration” occurred to considerable extents, while cis-trans equilibration between the two C1 hydrogen positions proceeded even faster. In the reaction of propylene-3-d1 the isotope mixing and “double-bond migration” were considerably slower than those of the cis-1-d1 species. Cis- and trans-1-d1 species were formed in equal amounts. The possible mechanism of these reactions is discussed on the basis of the results obtained.
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