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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
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Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides (CHIPS)
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Chemically reversible four-electron oxidation and reduction utilizing two inorganic functional groups.

Michael Nippe1, Samuel M Goodman, Charles G Fry

  • 1Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA.

Journal of the American Chemical Society
|February 16, 2011
PubMed
Summary
This summary is machine-generated.

A novel tungsten oxo compound exhibits reversible four-electron reactions, unlike inert mononuclear species. This reactivity stems from cooperative W-O and W-W multiple bonding in the ditungsten complex.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Mononuclear tungsten oxo species are typically chemically inert.
  • Quadruply bonded dinuclear tungsten compounds offer unique reactivity.
  • Understanding multielectron redox processes is crucial for catalysis and materials.

Purpose of the Study:

  • To synthesize and characterize a novel ditungsten terminal oxo compound.
  • To investigate the redox behavior and chemical reactivity of the new compound.
  • To explore the role of cooperative multiple bonding in the observed reactivity.

Main Methods:

  • Synthesis of the quadruply bonded W(2)(II,II) precursor.
  • Four-electron oxidation to form the ditungsten terminal oxo compound.
  • Four-electron reduction using tri-tert-butylphosphine in acetonitrile.

Main Results:

  • Formation of a novel, diamagnetic ditungsten terminal oxo compound [W(2)O(2,2'-dipyridylamide)(4)](2+).
  • The ditungsten oxo compound undergoes a facile four-electron reduction with oxygen-atom transfer.
  • The original dinuclear tungsten precursor W(2)(2,2'-dipyridylamide)(4) was recovered, demonstrating chemical reversibility.

Conclusions:

  • The synthesized ditungsten oxo compound displays unusual, chemically reversible multielectron reactivity.
  • This reactivity is attributed to the synergistic effects of W-O and W-W multiple bonding.
  • The findings challenge the general inertness of tungsten oxo species and highlight cooperative bonding.