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The carbene reactivity surface: a classification.

Jean-Luc Mieusset1, Udo H Brinker

  • 1Institut für Organische Chemie, Universität Wien, Währinger Strasse 38, A-1090 Wien, Austria.

The Journal of Organic Chemistry
|January 24, 2008
PubMed
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A novel two-dimensional classification for singlet carbenes integrates stability and reactivity. This system redefines carbene philicity scales, moving beyond alkene additions to C-H bond insertions.

Area of Science:

  • * Organic Chemistry
  • * Computational Chemistry

Background:

  • * Existing carbene philicity scales rely on addition reactions to alkenes.
  • * A new classification is needed to better describe carbene reactivity.
  • * Divalent species require a comprehensive understanding of their stability and philicity.

Purpose of the Study:

  • * Introduce a new two-dimensional classification for singlet carbenes.
  • * Develop a novel terminology for describing carbene reactivity.
  • * Establish a new experimental basis for carbene philicity scales using C-H bond insertions.

Main Methods:

  • * Investigated carbene reactivity through insertion reactions into C-H bonds of acetonitrile and isobutane.
  • * Developed a two-dimensional classification system based on reactivity differences.

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  • * Introduced new terminology for carbene reactivity.

    • Main Results:

    • * Acetyl carbene and cyclopentadienylidene identified as highly reactive electrophilic carbenes.
    • * Other alkylidenes and alkenylidenes exhibit lower activity and more nucleophilic character.
    • * Stabilized-nucleophilic carbenes like bicyclo[2.1.1]hex-2-en-5-ylidene show stability comparable to CAACs and aminophosphoniocarbenes.
    • * Observed strong hydrogen bridging between acetonitrile C-H bonds and nucleophilic carbenes.

    Conclusions:

    • * The new two-dimensional classification effectively categorizes singlet carbenes.
    • * Carbene reactivity can be accurately assessed via C-H bond insertion reactions.
    • * The findings provide a refined understanding of carbene stability and philicity.