Palladium-mediated catalysis which is useful in carbon-carbon bond formation usually involves Pdo to Pd" recycle.'The halogenation of azobenzene with palladium chloride represents an intriguing catalytic reaction that does not involve a palladium recycle. 2 A Pd" to PdIV transformation has been postulated for this reaction. We wish to describe a new catalytic carbon-carbon bond-forming reaction that does not involve recycle of palladium ...
