Abstract
Abstract Co-oxidation of styrene and iso- butyraldehyde with gas phase oxygen in the temperature range 20–35 °C has been studied in the presence of Co-, Fe- and Mn-T( p -SO 3 H)PP porphyrins in the liquid phase and supported on polyaniline (PANI) as catalysts. The reaction is proceeding along two parallel pathways: formation of benzaldehyde and epoxystyrene with products of its tautomeric isomerization, mainly phenylacetaldehyde. Iso- butyraldehyde is mediating the transfer of oxygen from the gas phase to styrene through generation of radicals by interaction with the porphyrin molecules and formation, by reaction with oxygen molecules, iso- butyracylperoxy radicals. Supporting the porphyrin molecules on polyaniline modifies their catalytic properties. The mechanisms of the two parallel reaction pathways to benzaldehyde and epoxystyrene+phenylacetaldehyde are discussed.
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