Pentacyanocobaltate catalyzes the hydrogenation of 6-methyl-3, 5-heptadien-2-one (and of 3, 5-heptadien-2-one) at the 5, 6 double bond, and also the 1,4-addition of hydrogen to the diene system of the dienone. The C=C bond in the 3, 4 position hardly reacts.
The cobalt complex accelerates the saturation of the activated C=C bond of 6-methyl-3-hepten-2-one. The isolated ethylene bond of 6-methyl-5-hepten-2-one fails to hydrogenate.
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Gvinter, L.I., Freidlin, L.K., Borunova, N.V. et al. Study of the direction of hydrogen addition to dienones in the presence of pentacyanocobaltate. Russ Chem Bull 21, 2248–2250 (1972). https://doi.org/10.1007/BF00855309
- Double Bond