Aryl-Metal Complexes by Electrophilic Attack on Arenes

One important mechanism for homogeneous catalytic activation of aromatic C—H bonds is electrophilic attack by transition-metal complexes on the aromatic substrates. It is presumed t -aryl complexes are important intermediates in these reactions, but they are rarely isolated. Direct electrophilic metallation of aromatic substrates is closely related to reactions observed with nontransition metals ( 5.6., auration 5.7.2., mercuration and 5.3., thallation - ). References to metal-aryl complexes synthesized by electrophilic attack on arenes by transition metals are sununarized in Table 1. Reviews are available . 

The first observation of y -aryl transition-metal species by direct electrophilic metallation in the reaction of benzene with H2PtCl6 and Na2[PtCl4] in aq CFjCOjH 

ff-Aryi-Metai Compiexes by Electrophilio Attack on Arenes. 

TabieI. Examples of (t- Aryl Complexes Synthesized by Electrophilic Attack on Arenes  

IrCp Me2(Me2SO) Ceile IrCp Me(Me2SO)(CaH5) 12 

---