Cycloadditions with a Stable Charge-Separated Cyclobutadiene-Type Amido-Substituted Silicon Ring Compound

Area of Science:

• Organosilicon Chemistry
• Main group element chemistry
• Synthetic inorganic chemistry

Background:

• The synthesis of novel silicon clusters and ring systems remains a significant challenge in inorganic chemistry.
• Understanding the reactivity and electronic properties of low-valent silicon compounds is crucial for developing new materials and catalysts.

Purpose of the Study:

• To explore the reductive debromination of a silicon precursor to form new silicon clusters and analogues.
• To investigate the cycloaddition and photochemical reactivity of the synthesized silicon compounds.

Main Methods:

• Reductive debromination using Rieke magnesium.
• Cycloaddition reactions with various unsaturated organic compounds.
• Photochemical isomerization using LED light (λ=405 nm).

Main Results:

• Formation of a five-vertex silicon cluster (Si5{N(SiMe3)2}5Br) and a cyclobutadiene analogue (2) in a 1:1 ratio.
• Synthesis of cyclic unsaturated ring compounds (3-6) via cycloaddition reactions at room temperature.
• Photochemical isomerization of products 3 and 6 to saturated ring compounds (4'e and 6').

Conclusions:

• The reductive debromination provides a viable route to novel silicon cluster and ring structures.
• The synthesized silicon compounds exhibit versatile reactivity in cycloaddition and photochemical transformations.
• This work expands the scope of silicon cluster and ring chemistry, offering potential for new material applications.