Abstract
Reactions of n-butenes have been investigated in the presence of C 3D 6 on iridium, rhodium, platinum, and chromium films and compared with the reactions on iron, nickel, and palladium films. The mechanisms of the reactions taking place on high-coordinate metal atoms (mainly isomerization) are hardly affected by the nature of the metal. On the contrary, the mechanisms of the reactions using low-coordinate metal atoms as sites (mainly exchange and hydrogenation) depend strongly upon the nature of the metal. It is suggested that the number of s electrons in the fundamental state of the metal plays an important role. The nature of the geometric effect on the olefin reactions has been described previously; in the present work a strong electronic effect on these reactions is established.
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