Abstract
Abstract Treatment of aryltellurium trihalides (ArTeX 3 : Ar = Ph, 4-BrC 6 H 4 , 4-MeC 6 H 4 , 4-MeOC 6 H 4 , 4-BuOC 6 H 4 , 4-PhOC 6 H 4 , 2-naphthyl; X = Cl, Br) with a palladium(II) salt in acetonitrile at 25°C affords, in good yields (29–78%), the corresponding biaryls (ArAr) either in the atmosphere or under 1 atm CO. The presence of CO accelerates this aromatic coupling significantly to produce some active palladium carbonyl species, the formation of which was confirmed by IR spectroscopy of Li 2 PdCl 4 in acetonitrile solution under CO; a strong sharp absorption and a weaker sharp one appeared at 2140 and 1908 cm −1 , respectively, attributable to the ν(CO) of the (PdCO) species. Treatment with alkali after reaction was essential to producing the biaryls.
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