Abstract
ABSTRACT PdCl2 exhibits very high catalytic activity and acetophenone selectivity for liquid-phase oxidation of styrene under mild conditions at 55 °C, H2O2/styrene = 1.15 (mole ratio) and acetone as cosolvent. The effect of cosolvents and phase transfer reagents on the reaction is investigated. The results show that the use of acetone as cosolvent or sodium dodecyl sulfate as phase-transfer reagent can accelerate the reaction. The conversion of styrene is high when the mole ratio of styrene to PdCl2 over the range of 400∼1500. The selectivity for acetophenone decreases significantly by adding some chelating ligands to the catalytic system. The selectivity for benzaldehyde decreases significantly by adding some radical inhibitor to the catalytic system. These results show that that benzaldehyde may be produced through radical auto-oxidation mechanism while acetophenone may be produced through coordination catalysis mechanism.
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