A bromo(boryloxy) silylene and its heavier analogues

Area of Science:

• Organometallic Chemistry
• Main Group Chemistry

Background:

• Divalent group 14 compounds are crucial in synthetic chemistry.
• Previous research has focused on cyclic or less reactive acyclic analogues.
• The development of stable, reactive acyclic tetrylenes remains a significant challenge.

Purpose of the Study:

• To synthesize and characterize novel acyclic divalent and dicoordinate group 14 compounds.
• To explore the utility of N-heterocyclic boryloxy ligands in stabilizing low-valent main group elements.
• To investigate the reactivity of these new compounds, particularly halo(boryloxy) silylenes.

Main Methods:

• Synthesis of a novel N-heterocyclic boryloxy ligand with bulky diazaboryl N-substituents.
• Reaction of the ligand with appropriate precursors to generate divalent group 14 compounds.
• Characterization of the synthesized compounds using spectroscopic and analytical techniques.
• Investigation of the reactivity of bromo(boryloxy) silylene with benzophenone.

Main Results:

• Successful synthesis of the first examples of acyclic halo(boryloxy) tetrylenes.
• The bromo(boryloxy) silylene derivative demonstrated high reactivity.
• The reaction of bromo(boryloxy) silylene with benzophenone yielded a siloxindane product.
• The bulky N-substituents on the boryloxy ligand play a key role in stabilizing the divalent species.

Conclusions:

• N-heterocyclic boryloxy ligands are effective in stabilizing unprecedented acyclic halo(boryloxy) tetrylenes.
• These novel compounds represent a new class of reactive intermediates in main group chemistry.
• The demonstrated reactivity opens avenues for further synthetic applications of these tetrylenes.