4,5-Disubstituted N,N'-Di-tert-alkyl Imidazolium Salts: New Synthesis and Structural Features

Abstrakt

It's getting crowded! The synthesis of a new subfamily of imidazolium cations with exceptionally spatially demanding substitution patterns (see scheme) paved the way to reconcile two antagonising effects: steric hindrance and innately high donating ability/basicity in the peralkylated imidazol-2-ylidene ligands/uncharged bases.

Klíčová slova

• basicity
• carbenes
• imidazolium cations
• steric hindrance
• synthetic methods