FLUXIONAL BEHAVIOR OF ALLYLPALLADIUM(II) DERIVATIVES OF N,N'-DIARYLFORMAMIDINES AND 1,3-DIARYLTRIAZENES

Reactions of allylpalladiumchloride dimer with neutral ligands (L = RNCHNHR, R = C6H5CH2, p-CH3C6H4, p-ClC6H4; L = RNNNHR, R = p-CH3C6H4, p-ClC6,H4) afford bridge splitting products of the type PdClL(1,3-η-C3H5). Variable temperature 1H and 13C NMR spectra show two dynamic processes in solution. The first one, operating at room temperature, involves the dissociation of the neutral ligand L; the second one, which has a lower activation energy, is concentration dependent and involves chloride-L exchange, probably via a pentacoordinated chloro bridged species. The influence of the basicity of the ligands on the activation energies of the processes is discusseed. © 1979.