ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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 [FeX_n]^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)