The deprotonation of acyclic palladium amidine chloride () with potassium -butoxide in tetrahydrofuran results in palladium bis(formamidinate) (). undergoes a nucleophilic addition reaction with acetonitrile in the presence of PdCl or Pd(OAc) (OAc = acetate) to give dinuclear cyclic six-membered (triazapentadiene)palladium complexes ( and ). These compounds are also prepared from cyclic six-membered (tap)PdCl (; tap = triazapentadiene) or formamidinium salts (-) with Pd(OAc)/NaOAc in acetonitrile, whereas the direct reaction of with acetonitrile or acrylonitrile resulted in palladium black or an acyclic C-N-coupled product (). A comparison of structure from suggests a possible intermediate dinuclear palladium complex whose structure was identified through theoretical calculations. Further, Suzuki-Miyaura cross-coupling reactions were carried out under different solvents notably in an ethanol/water medium at room temperature.
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