ALLYLIC OXIDATION OF α-PINENE OVER SUPPORTED SeO2-BASED CATALYSTS

MUSSO, F.A.; GUTIERREZ, V.; VOLPE, M.A.; FARAONI, M.B.

LATIN AMERICAN APPLIED RESEARCH

Plapiqui

Año: 2023 vol. 53 p. 287 - 293

0327-0793

SeO2-based samples were tested for the oxidation of α-pinene and of benzil alcohol using eth-anol as solvent. Commercial SeO2 was tested both at reflux and at 6 atm. of O2. At conversion level of ap-proximately 40%, the yield of myrtenal was much higher in the latter case (34.4%) than under reflux (18.0%). A palladium-promoted selenium dioxide-supported catalyst (Pd/SeO2/SiO2) was prepared. Characterization results indicated that selenium diox-ide (14.4%) strongly interacts with silica support. The introduction of palladium (0.98%) modifies the re-ducibility of SeO2, originating a selenium species acti-vation towards allylic oxidation. A conversion level of 23% is attained over Pd/SeO2/SiO2 after 15 h of reac-tion time, using ethanol as solvent at 134°C the main product being myrtenal, obtained with a selectivity of 76%. Pd/SeO2/SiO2 allows to carry out a catalytic al-lylic oxidation of α-pinene, being the catalyst easy to handle and being possible its recovery and reuse after the reaction in liquid phase.