Germyliumylidene: A Versatile Low Valent Group 14 Catalyst

Area of Science:

• Organometallic Chemistry
• Catalysis
• Main Group Chemistry

Background:

• Bis-NHC stabilized germyliumylidenes ([RGe(NHC)2]+) are generally Lewis basic due to lone pair availability and NHC coordination.
• These compounds can also exhibit Lewis acidity through the Ge-C NHC σ* orbital.

Purpose of the Study:

• To explore the ambiphilic nature of bis-NHC stabilized germyliumylidenes.
• To demonstrate the catalytic applications of these unique compounds in chemical reactions.

Main Methods:

• Synthesis of a novel bis-NHC-stabilized germyliumylidene, [MesTerGe(NHC)2]Cl (1).
• Utilizing compound 1 as a catalyst in the reduction of CO2 with amines and arylsilane.
• Employing compound 1 as a Lewis acid catalyst for hydroboration and cyanosilylation of carbonyls.

Main Results:

• The Lewis basicity of [MesTerGe(NHC)2]Cl was utilized for CO2 reduction catalysis.
• The Lewis acidity of the same compound catalyzed hydroboration and cyanosilylation reactions.
• The study successfully demonstrated the versatile ambiphilic reactivity of bis-NHC stabilized germyliumylidenes.

Conclusions:

• Bis-NHC stabilized germyliumylidenes possess a versatile ambiphilic character.
• This dual Lewis basicity/acidity allows for diverse catalytic applications.
• The findings open new avenues for utilizing main group compounds in catalysis.