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Related Experiment Videos

Sterically encumbered systems for two low-coordinate phosphorus centers.

S Shah1, T Concolino, A L Rheingold

  • 1Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106-7708, USA.

Inorganic Chemistry
|February 24, 2001
PubMed
Summary

Sterically demanding tetraarylphenyl ligands enable the synthesis of novel compounds with two phosphorus centers. This research introduces new bis(phosphaalkenes) and bis(diphosphene) materials with unique structural properties.

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Area of Science:

  • Organometallic Chemistry
  • Materials Science
  • Synthetic Chemistry

Background:

  • Sterically demanding ligands are crucial for controlling reactivity and stability in organometallic compounds.
  • Low-coordinate phosphorus compounds offer unique electronic and structural properties for advanced materials.

Purpose of the Study:

  • To synthesize novel compounds featuring two p-phenylene-bridged phosphorus centers using sterically demanding tetraarylphenyl ligands.
  • To explore the synthesis and structural characterization of new bis(phosphaalkenes) and bis(diphosphene) derivatives.

Main Methods:

  • A one-pot synthesis of a key precursor, 1,4-diiodo-2,3,5,6-tetrakis(p-tert-butylphenyl)benzene.
  • Conversion of the precursor to bis(dichlorophosphine) and bis(phosphine) intermediates.

Related Experiment Videos

  • Reaction of the bis(dichlorophosphine) with aldehydes and trimethylphosphine/zinc to form bis(phosphaalkenes).
  • Synthesis of a bis(diphosphene) derivative from the bis(dichlorophosphine).
  • Structural characterization using X-ray crystallography.

    • Main Results:

    • Efficient synthesis of the tetraarylbenzene precursor and subsequent bis(phosphine) and bis(dichlorophosphine) compounds.
    • Successful synthesis of two novel bis(phosphaalkenes) with yields of 42% and 46%.
    • Formation and structural characterization of an unusual bis(diphosphene) with a P=P bond length of 2.008(2) A.
    • Determination of a P=C bond length of 1.676(5) A in a bis(phosphaalkene).

    Conclusions:

    • Sterically encumbered tetraarylphenyl ligands facilitate the construction of novel molecules with p-phenylene-bridged phosphorus centers.
    • The synthesized bis(phosphaalkenes) and bis(diphosphene) represent new classes of compounds with potential applications in materials science.
    • The study highlights the versatility of the developed synthetic routes for accessing unique low-coordinate phosphorus compounds.