Journal
RESEARCH ON CHEMICAL INTERMEDIATES
Volume 26, Issue 9, Pages 913-922Publisher
VSP BV
DOI: 10.1163/156856700X00390
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The catalytic hydrogenation of an optically active mixture of (-)-menthone and (+)-isomenthone was studied. The catalysts Raney nickel and Ni/SiO2 were used for these hydrogenations. Catalysts modified with (2R,3R)-(+)-tartaric acid were tested as well. Various non-equilibrium mixtures of isomers were produced by means of these reactions, especially mixtures containing the less stable menthol isomers, (+)-neomenthol and (+)-neoisomenthol. (-)-Menthol was produced during these reactions to a limited extent; the production of(-)-isomenthol was barely existent. Isomerization of (-)menthone and (+)-isomenthone occurred during these reactions. Isomerizations among individual isomers were barely detectable. The catalysts used showed a very low activity under the given reaction conditions.
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