Abstract
1. Deutero-hydrogen exchange in cyclohexene was studied under the conditions of its hydrogenation and dehydrogenation on a nickel catalyst in a circulation flow system at temperatures from 31 to 293°. 2. The isotopic exchange of hydrogen in cyclohexene under the conditions studied proceeds at a substantially lower rate than its hydrogenation and dehydrogenation. 3. There is no kinetic isotopic effect when hydrogen is replaced by deuterium in the hydrogenation of cyclohexene. 4. The rates of hydrogenation of cyclohexadiene and cyclohexene and mixtures of them with benzene significantly exceed the rate of hydrogenation of the latter. 5. The limiting step of the hydrogenation of cyclohexene under the conditions studied is its adsorption.
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