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Gallium Methylene.

Martin Bonath1, Cäcilia Maichle-Mössmer1, Peter Sirsch1

  • 1Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany.

Angewandte Chemie (International Ed. in English)
|April 4, 2019
PubMed
Summary
This summary is machine-generated.

Researchers synthesized elusive homoleptic gallium methylene compounds using rare-earth metallocene methyl complexes. These novel compounds act as efficient methylene-transfer reagents in organic synthesis.

Keywords:
C−H bond activationgalliumlutetiummethylideneyttrium

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Materials Science

Background:

  • Metal alkylidene species are crucial for organic synthesis and industrial catalysis.
  • Homoleptic metal methylene compounds, the simplest alkylidenes, have been elusive.
  • Previous reports yielded insoluble polymeric materials unsuitable for reagent applications.

Purpose of the Study:

  • To synthesize and characterize molecular homoleptic metal methylene compounds.
  • To explore their reactivity as methylene-transfer reagents.
  • To investigate their potential in organic synthesis and catalysis.

Main Methods:

  • Reaction of rare-earth metallocene methyl complexes with trimethylgallium.
  • Characterization of dodecametallic clusters as key intermediates.
  • Analysis of homoleptic gallium methylene cluster formation via C-H activation.
  • Investigation of oligomerization and reactivity in donor solvents.

Main Results:

  • Successful synthesis of homoleptic gallium methylene clusters [Ga8 (μ-CH2 )12 ] from trimethylgallium.
  • Identification of dodecametallic clusters as crucial intermediates in a cascade C-H activation process.
  • Observation of a reversible [Ga8 (μ-CH2 )12 ]/[Ga6 (μ-CH2 )9 ] oligomer switch in donor solvents.
  • Demonstration of these gallium methylene compounds as effective Schrock-type methylene-transfer reagents.

Conclusions:

  • This study provides access to elusive homoleptic gallium methylene compounds.
  • The synthesized compounds exhibit unique oligomerization behavior and serve as valuable methylene-transfer reagents.
  • These findings open new avenues for utilizing metal alkylidenes in synthetic chemistry and catalysis.