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Hydrido(hydrosilylene)tungsten complexes: dynamic behavior and reactivity toward acetone.
Takahito Watanabe1, Hisako Hashimoto, Hiromi Tobita
1Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan.
Tungsten nitrile complexes react with silicon hydrides to form hydrido(hydrosilylene) tungsten complexes. These complexes exhibit strong interligand interactions and undergo facile H/D exchange, particularly under UV light, and react with acetone via hydrosilylation or alpha-H abstraction.
Area of Science:
- Organometallic Chemistry
- Silicon Chemistry
- Coordination Chemistry
Background:
- Tungsten nitrile complexes serve as precursors for novel organometallic compounds.
- Hydrosilylene complexes are of interest due to their unique bonding and reactivity.
- Understanding interligand interactions is crucial for catalyst design and reaction mechanisms.
Purpose of the Study:
- To synthesize and characterize novel hydrido(hydrosilylene) tungsten complexes.
- To investigate the structural and electronic properties, including interligand interactions.
- To explore the reactivity of these complexes with silicon hydrides and organic substrates.
Main Methods:
- Synthesis of tungsten nitrile complexes and their reaction with various silicon hydrides.
- Characterization using neutron diffraction, NMR spectroscopy (variable-temperature), and mass spectrometry.
- Reactions with acetone to study hydrosilylation and alpha-H abstraction pathways.
Main Results:
- Successful synthesis of hydrido(hydrosilylene) tungsten complexes [(Cp*)W(CO)(2)(H)=Si(H){C(SiMe(3))(3)}] and [(η(5)-C(5)Me(4)Et)(CO)(2)(H)W=SiMes(2)].
- Confirmation of strong hydrido-silylene interligand interaction via neutron diffraction.
- Observation of facile H/D exchange under UV irradiation and dynamic carbonyl ligand behavior.
- Acetone reactions yield hydrosilylation products or alpha-H abstraction products depending on temperature.
Conclusions:
- Novel hydrido(hydrosilylene) tungsten complexes have been synthesized and characterized.
- Strong interligand interactions play a significant role in the stability and reactivity of these complexes.
- The complexes display interesting photochemical reactivity and diverse reaction pathways with organic substrates.
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