Cascade transformations of (±)-citronellal to menthol over extruded Ru-MCM-41 catalysts in a continuous reactor was written by Vajglova, Zuzana;Kumar, Narendra;Peurla, Markus;Eranen, Kari;Maki-Arvela, Paivi;Murzin, Dmitry Yu. And the article was included in Catalysis Science & Technology in 2020.Name: 3,7-Dimethyloctan-1-ol The following contents are mentioned in the article:
Cascade transformations of (±)-citronellal in a continuous mode were investigated over a bifunctional shaped ruthenium catalyst bearing metal clusters of the size 7-13 nm. Four types of Ru/H-MCM-41 extrudates (1.5 x 10 mm) containing 30% of Bindzil-50/80 colloidal silica binder were prepared varying in metal location and metal-to-acid ratio, while the concentration of Bronsted and Lewis acid sites and textural properties of the final extrudates were comparable. Catalytic tests were performed in the trickle-bed reactor under 70°C, 10 bar of H2, and the initial reactant concentration in cyclohexane 0.086 mol L-1 for the liquid residence time of 12.5 min. As a reactant, isopulegol, citronellol or (±)-citronellal was used. Metal location in extrudates has a significant effect on the catalytic activity and selectivity especially in terms of isopulegol isomers which content correlated with the metal-to-acid site ratio. Stereoselectivity to the desired (±)-menthol was 68-70%. The highest amount of the desired menthol, 32% yield, was obtained over extrudates where Ru was deposited on the catalytic support, i.e. with the shortest distance between the acid and metal sites, the lowest Bronsted acidity, the lowest Bronsted-Lewis acid sites ratio, the highest sp. surface area and the narrowest range of the Ru particle size distribution. This study involved multiple reactions and reactants, such as 3,7-Dimethyloctan-1-ol (cas: 106-21-8Name: 3,7-Dimethyloctan-1-ol).
3,7-Dimethyloctan-1-ol (cas: 106-21-8) belongs to alcohols. The oxygen atom of the strongly polarized O―H bond of an alcohol pulls electron density away from the hydrogen atom. This polarized hydrogen, which bears a partial positive charge, can form a hydrogen bond with a pair of nonbonding electrons on another oxygen atom. The most common reactions of alcohols can be classified as oxidation, dehydration, substitution, esterification, and reactions of alkoxides.Name: 3,7-Dimethyloctan-1-ol
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts