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Alkane oxidation by osmium tetroxide.

Brian C Bales1, Peter Brown, Ahmad Dehestani

  • 1University of Washington, Department of Chemistry, Box 351700, Seattle, Washington 98195-1700, USA.

Journal of the American Chemical Society
|March 3, 2005
PubMed
Summary
This summary is machine-generated.

Aqueous alkaline osmium tetroxide (OsO4) oxidizes saturated alkanes at 85°C, converting isobutane to tert-butanol. This ligand-accelerated catalysis offers a new pathway for alkane functionalization.

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Area of Science:

  • Inorganic Chemistry
  • Organic Chemistry
  • Catalysis

Background:

  • Alkane C-H bond oxidation is challenging due to their inertness.
  • Osmium tetroxide (OsO4) is a powerful oxidant, typically used for alkene dihydroxylation.

Purpose of the Study:

  • To investigate the oxidation of saturated alkanes using aqueous alkaline OsO4.
  • To explore the mechanism and scope of this novel alkane oxidation reaction.

Main Methods:

  • Reaction of various alkanes (isobutane, cyclohexane, ethane, propane) with OsO4 in aqueous alkaline solution at 85°C.
  • Utilizing sodium periodate (NaIO4) as a terminal oxidant for catalytic turnovers.

Main Results:

  • Isobutane was quantitatively oxidized to tert-butanol.
  • Cyclohexane yielded adipate and succinate.
  • Ethane and propane were oxidized to acetate.
  • Ligand-accelerated catalysis was observed, requiring hydroxide binding to OsO4.

Conclusions:

  • Aqueous alkaline OsO4 effectively oxidizes primary, secondary, and tertiary C-H bonds in alkanes.
  • A concerted mechanism involving [3+2] cycloaddition is proposed, analogous to alkene dihydroxylation.
  • This work demonstrates a new catalytic method for alkane functionalization.