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Constructing Cyclic Peptides Using an On-Tether Sulfonium Center
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A neutral cyclic aluminium (I) trimer.

Imogen Squire1, Matthew de Vere-Tucker1, Michelangelo Tritto1

  • 1Department of Chemistry, King's College London, Britannia House, London, UK.

Nature Communications
|January 30, 2026
PubMed
Summary
This summary is machine-generated.

Researchers synthesized neutral aluminum(I) trimers, or cyclotrialumanes, which act as versatile reductants. These trimers exhibit unique reactivity, activating small molecules and forming novel aluminum-carbon ring systems.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Low oxidation state aluminum complexes are recognized as versatile 2-electron reductants.
  • Neutral monomeric, dimeric, and tetrameric aluminum structures are known, but trimeric structures were absent.
  • Trimeric nuclearity was not previously considered in reaction mechanism investigations.

Purpose of the Study:

  • To synthesize and characterize neutral trimeric aluminum(I) structures.
  • To investigate the reactivity and bonding nature of these novel trimers.
  • To explore their potential in small molecule activation and catalysis.

Main Methods:

  • Synthesis of novel neutral Al(I) trimers (cyclotrialumanes).
  • Extensive characterization using experimental techniques (e.g., spectroscopy, X-ray diffraction).
  • Computational modeling to understand electronic structure and bonding.

Main Results:

  • Two neutral cyclotrialumane structures were successfully synthesized and characterized.
  • Al-Al bonds were found to be predominantly covalent, with the trimeric structure stable in solution.
  • The cyclotrialumanes demonstrated high reactivity, activating H2, alkynes, and benzene.
  • Unique reactions with ethylene led to the formation of 5- and 7-membered Al-C rings, showcasing trimeric reactivity.

Conclusions:

  • Neutral trimeric aluminum(I) complexes (cyclotrialumanes) have been synthesized for the first time.
  • These compounds exhibit unique covalent Al-Al bonding and retain structural integrity in solution.
  • Cyclotrialumanes are highly reactive reductants, capable of activating small molecules and forming novel organoaluminum structures through trimeric reaction pathways.