A Stable Homoleptic Divinyl Tetrelene Series

Area of Science:

• Organometallic Chemistry
• Main Group Chemistry
• Ligand Design

Background:

• Development of novel organometallic reagents is crucial for expanding synthetic capabilities.
• Bulky ligands play a key role in stabilizing reactive species and enabling unique reactivity.
• The synthesis and characterization of low-coordinate silicon species remain a significant challenge.

Purpose of the Study:

• To report the synthesis of a new bulky vinyllithium reagent, (MeIPr=CH)Li.
• To demonstrate its utility as a precursor for the anionic ligand [MeIPr=CH]-.
• To synthesize a series of divinyltetrelenes and characterize novel low-coordinate silicon species.

Main Methods:

• Synthesis of (MeIPr=CH)Li from a bulky N-heterocyclic carbene precursor.
• Reaction of (MeIPr=CH)Li with EBr2 (E = Si to Pb) to form divinyltetrelenes.
• Characterization of the resulting compounds using spectroscopic and crystallographic techniques.
• Electrochemical studies, including cyclic voltammetry, to assess redox properties.

Main Results:

• Successful synthesis of the bulky vinyllithium reagent (MeIPr=CH)Li.
• Generation of a complete inorganic divinyltetrelene series, (MeIPrCH)2E (E = Si to Pb).
• Isolation and characterization of the first two-coordinate acyclic silylene, (MeIPrCH)2Si, exhibiting dual electrophilic and nucleophilic character.
• Demonstration of the silylene's potent reducing ability, comparable to cobaltocene.

Conclusions:

• The bulky vinyllithium reagent is a versatile precursor for synthesizing unique organometallic compounds.
• The novel acyclic silylene represents a significant advancement in low-coordinate silicon chemistry.
• The electron-rich nature of the silylene makes it a powerful reducing agent with potential applications in catalysis.