Reaction pathway for the direct benzene hydroxylation by iron-oxo species

Research output: Contribution to journalArticle

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Abstract

The direct benzene hydroxylation by an iron-oxo species is discussed from density-functional-theory (DFT) calculations. The proposed reaction pathway is FeO+ + C6H6 → OFe+(C6H6) → [TS1] → HO-Fe+-C6H5 → [TS2] → Fe+(C6H5OH) → Fe+ + C6H5OH, in which TS means transition state. This reaction is initiated by the formation of the reactant complex, OFe+(C6H6), exhibiting an η2-C6H6 binding mode; benzene C-H bonds are activated on this complex due to significant electron transfer from the benzene to the iron-oxo species. The reaction should proceed in a concerted manner, neither via the formation of radical species nor ionic intermediates. The reaction mechanism is quite similar to the two-step concerted mechanism that we have proposed originally for the direct methane hydroxylation by an iron-oxo species. The quartet potential energy surface affords a low-cost reaction pathway for the benzene hydroxylation, spin inversion being unimportant in contrast to the methane hydroxylation in which crossing between the sextet and quartet potential energy surfaces plays an important role. We suggest that our two-step concerted mechanism should be widely applicable to hydrocarbon hydroxylations catalyzed by transition-metal oxides if coordinatively unsaturated metal oxides are responsible for such important catalytic reactions.

Original languageEnglish
Pages (from-to)147-153
Number of pages7
JournalJournal of the American Chemical Society
Volume121
Issue number1
DOIs
Publication statusPublished - Jan 13 1999
Externally publishedYes

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Hydroxylation
Benzene
Iron
Potential energy surfaces
Methane
Oxides
Metals
Hydrocarbons
Transition metals
Density functional theory
Electrons
Costs and Cost Analysis
Costs

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Reaction pathway for the direct benzene hydroxylation by iron-oxo species. / Yoshizawa, Kazunari; Shiota, Yoshihito; Yamabe, Tokio.

In: Journal of the American Chemical Society, Vol. 121, No. 1, 13.01.1999, p. 147-153.

Research output: Contribution to journalArticle

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