Evidence for Carbon-Carbon Meisenheimer-Wheland Complexes between Superelectrophilic and Supernucleophilic Carbon Reagents

摘要

The observation,or the isolation(when it is possible),of intermediates in nucleophilic aromatic substitution(S_NAr;the so-called Meisenheimer complexes M)and in electro-philic aromatic substitution(the so-called Wheland complexes W)reactions is an important confirmation of the proposed mechanisms.Our interest has,in the past,focused on intermediates in the S_NAr reaction and,more recently,also on electrophilic aromatic substitution reactions(Wheland intermediates).