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A phosphine-stabilized silylene rhodium complex.

N Almenara1, J I Miranda, A Rodríguez-Diéguez

  • 1Department of Applied Chemistry, University of Basque Country (UPV/EHU), 20080 San Sebastián, Spain. miguelangel.huertos@ehu.es.

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|November 16, 2019
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Summary
This summary is machine-generated.

Researchers report the first phosphine-stabilized cationic rhodium silylene complex. This novel compound reacts with water, alcohols, and benzophenone, forming new rhodium-silyl compounds and releasing hydrogen gas.

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Area of Science:

  • Organometallic Chemistry
  • Silicon Chemistry
  • Rhodium Catalysis

Background:

  • Silylene complexes are reactive intermediates in organosilicon chemistry.
  • Rhodium complexes are widely used catalysts in organic synthesis.
  • Understanding silylene reactivity is crucial for developing new synthetic methodologies.

Purpose of the Study:

  • To synthesize and characterize the first phosphine-stabilized cationic rhodium silylene complex.
  • To investigate the reactivity of this novel complex with various substrates, including water, alcohols, and ketones.
  • To explore the potential of this complex as an intermediate in catalytic reactions like hydrosilylation.

Main Methods:

  • Synthesis of a dihydrido-silylene-Rh(iii) precursor.
  • Reaction of the silylene complex with water and alcohols.
  • Reaction of the cationic silylene rhodium complex with benzophenone.
  • Characterization of the resulting alkoxysilyl-Rh(iii) complexes using spectroscopic techniques.

Main Results:

  • The first phosphine-stabilized cationic rhodium silylene complex was successfully synthesized.
  • The silylene complex reacts with water and alcohols to yield alkoxysilyl-Rh(iii) complexes and hydrogen gas.
  • Reaction with benzophenone leads to carbonyl group reduction and formation of an alkoxysilyl-Rh(iii) compound.
  • The observed product is identified as a potential intermediate in the Hofmann-Gade mechanism for ketone hydrosilylation.

Conclusions:

  • The development of phosphine-stabilized cationic rhodium silylene complexes opens new avenues in organometallic chemistry.
  • These complexes exhibit unique reactivity towards protic solvents and carbonyl compounds.
  • The findings provide valuable insights into the mechanism of rhodium-catalyzed hydrosilylation reactions.