Effect of Heterogeneous and Homogeneous Pathways on Selectivity of Pinane-2-ol to Linalool Isomerization
Journal of Molecular Catalysis A: Chemical
||Isomerization, Kinetics, Linalool, Mechanism, Pinane-2-ol
Boreskov Institute of Catalysis, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russia
The regularities of pinane-2-ol isomerization over block catalyst under reagent pressure of 2–45 Torr and within a temperature range of 450–620 °C were studied. A scheme of key product—linalool, as well as side products—hydrocarbons and 5-membered cyclic alcohols formation was suggested. Light hydrocarbons C1–C6 are formed by gas phase free radical pathway of pinane-2-ol destruction, hydrocarbons C10 by linalool dehydration over catalyst surface acid centers, 5-membered cyclic alcohols by linalool intermolecular cyclization.
The reaction rate constants of cis/trans-pinane-2-ol conversion to linalool and its following cyclization to 5-membered alcohols were evaluated. The linalool formation mechanism including the intermolecular interaction of OH group proton resulting in pinane ring opening was suggested.