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Sterically Stabilized Homoleptic Copper and Gold Allyl Complexes.

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  • 1Department of Chemistry, Vanderbilt University, VU Station B #351822, Nashville, Tennessee 37235, United States.

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Summary
This summary is machine-generated.

Stable allyl derivatives of copper and gold were synthesized. The copper complex demonstrates utility in conjugate allylation reactions, offering new insights into coinage metal chemistry.

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Synthetic Chemistry

Background:

  • Allyl derivatives of coinage metals are scarce due to thermal and redox instability.
  • Well-defined allyl complexes are crucial for understanding metal-mediated reactions.

Purpose of the Study:

  • To synthesize and characterize stable allyl derivatives of copper and gold.
  • To investigate the reactivity of these novel complexes, particularly in organic synthesis.
  • To explore the structural and electronic factors influencing the stability and reactivity of coinage metal allyl complexes.

Main Methods:

  • Solution and mechanochemical synthesis methods were employed.
  • X-ray crystallography was used for structural elucidation of the synthesized complexes.
  • Density Functional Theory (DFT) calculations were performed to understand aggregation influences.

Main Results:

  • A stable potassium bis-(allyl)-cuprate, [KCuA'2], and its gold analogue, [KAuA'2], were successfully isolated and characterized, existing as dimers in the solid state.
  • The copper complex, [{KCuA'2}2], effectively catalyzes the conjugate (1,4)-allylation of α,β-unsaturated ketones.
  • Structural analysis revealed planar K2Cu2 and K2Au2 cores with eta1-bound allyl ligands, while neutral tetrameric species [{CuA'}4] and [{AuA'}4] were also formed.
  • Gold analogues did not exhibit the same reactivity as their copper counterparts.

Conclusions:

  • The synthesized potassium bis-(allyl)-cuprate represents a stable and reactive species for organic transformations.
  • The study provides valuable structural and reactivity benchmarks for coinage metal allyl complexes.
  • DFT calculations suggest that silyl groups and potassium counterions influence the aggregation state of allyl cuprates.