Conversion of Metallabenzynes into Carbene Complexes

摘要

The chemistry of transition metal-containing metallabenzenes has attracted considerable attention. Previous studies have led to the isolation and characterization of a number of stable metallabenzenes, especially those of osmium, iridium, platinum ruthenium, and rhenium. Many interesting chemical properties of metallabenzenes have also been discovered. For example, it has been demonstrated that metallabenzenes can undergo electrophilic substitution reactions, cycloaddition reactions, nucleophilic addition reactions, and nucleophilic aromatic substitution of hydrogen. Another common reactivity of metallabenzenes is that they can undergo migratory insertion reactions to give cyclopentadienyl complexes. The transformation has been demonstrated with well-characterized metallabenzenes as well as a spectroscopically characterized ruthena-benzene, and it has been proposed as a key step in the formation of cyclopentadienyl complexes.