We have demonstrated that 4,4¢-dimethyl 2,2¢-bipyridine as ligand for Pd(II) catalysts was very efficient for oxidative Heck-type coupling reaction of arylboronic acids with olefins in DMA or CH 3 CN under atm air at 80°C. The presence of chelated bipyridine ligand isindispensable to achieve high reaction yields and to suppress the formation of biphenyl as homocoupled byproduct.
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