Dehydro arenes

Rh(Tp )(COD)] has been employed as catalyst in the dehydro-genative coupling of 4,4,5,5-tetramethyl-l,3,2-dioxaborolane with arene. Several pyrazolylborates have been employed and it has been found that the catalytic activity is affected by substituents on the pz... 

An important route for the C-H activation of arenes and heteroarenes is through electrophilic metallation of an aromatic ring, followed by reaction with an alkene. There are numerous simple examples with arenes and heteroarenes reacting with alkenes under palladium catalysis." This has been referred to as the dehydro-genative Heck reaction and the oxidative Heck reaction, as well as the Fujiwara reaction, or Fujiwara-Heck reaction. Both benzene 3.4 and its derivatives (Schemes 3.6 and 3.7) and heteroarenes (Schemes 3.8 and 3.9) can be used. While the reaction has been carried out with a stoichiometric amount of palladium, catalytic processes, with an added oxidant are widespread. 

---