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Effect of ligands in iron(III) complexes on the catalytic oxidation of triphenylphosphine by molecular oxygen

V. Vančová, I. Ondrejkovičová, and G. Ondrejovič

Dep. Microanal., Slov. Tech. Univ., Bratislava


Abstract:  Triphenylphosphine (PPh3) in acetonitrile solution undergoes oxidation with dioxygen in the presence of iron(III) compounds of the type FeX3 and FeX3(OPPh3)2 (X = Cl, Br, NCS) as catalysts at moderately increased tempera­ture, to give triphenylphosphine oxide (OPPh3). The rate of oxidation of PPh3 to OPPh3 depends on the nature of the ligand X bonded in the complex. It increases depending on X in the order of Cl<NCS<Br. A shifting of the equilibrium of the complexes towards [FeXn]3-n (n = 4 — 6 ) makes the oxida­tion rate essentially decrease.

Full paper in Portable Document Format: 383a363.pdf (in German)


Chemical Papers 38 (3) 363–369 (1984)

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