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The catalytic hydrogenation of cyclic olefins was investigated over various nickel catalysts. The hydrogenation of cyclohexene was promoted by basic reaction conditions and depressed by acidic ones, the hydrogenation of cyclooctene being only slightly influenced by the acidity. The results of competitive hydrogenation indicate that cyclooctene is adsorbed more strongly on nickel catalysts than cyclohexene. The external olefinic bond is preferentially hydrogenated to the internal olefinic bond.
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Kajitani et al. (1974) studied this question.
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