Change in the selectivity of the action of catalysts in the hydrogenation of the dienone group
In the case of the modification of Ni-black with the lead cation, as well as that of Ni-catalysts on carriers, the direction of the addition of H2 to a dienone is changed; the basic product of hydrogenation is 5-hepten-2-one.
It was established by the method of deuteroexchange that on Ni-black modified with firmly adsorbed Pb, saturation of the 3,4-double bond occurs not only by the direct addition of H2 to the C=C bond, but also by 1,4-addition to the C=C-C=0 group of the dienone.
KeywordsHydrogenation Basic Product Direct Addition Lead Cation
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