The Selective Hydrogenation of α-Methylcinnamaldehydes Catalyzed by Cobalt Carbonyl in the Presence of Amines
- 1 November 1973
- journal article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 46 (11) , 3562-3565
- https://doi.org/10.1246/bcsj.46.3562
Abstract
The selective hydrogenation of α-methylcinnamaldehydes to the hydrocinnamaldehydes, catalyzed by cobalt carbonyl and a limited amount of amines, has been investigated. The addition of such amines as diisopropylamine, diethanolamine, tributylamine, triethylamine, and pyridine showed a remarkable selectivity and gave the desired α-methylhydrocinnamaldehydes in 96.4–91.5% theoretical yields. Especially, diisopropylamine gave the best selectivity, in it the yields of p-t-butyl-α-methylhydrocinnamaldehyde and cyclamenaldehyde amounted to 96%. The optimum amount was found to be 1.0–1.3 equivalents of cobalt carbonyl.Keywords
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