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The nucleophilic displacement of iodobenzene with potassium cyanide was carried out in HMPA in the presence of palladium(II) acetate. The reaction obeys the following kinetics; d[C_6H_5CN]/dt=k[Pd(OAc)_2]_0(M_KCN)^2/3 A reaction scheme composed of two cycles has been proposed: in one cycle Pd0 activates iodobenzene and in the other cycle Pd2+ assists the dissolution of potassium cyanide.
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Takagi et al. (1976) studied this question.
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