Synthesis and structure of cationic nickel allyl complexes supported by β-diimine ligands

Reaction of (1,2-dimethoxyethane)NiBr2 a with β-iminoamines ligands c–f is reported and produces a series of paramagnetic complexes (β-diimine)NiBr2 1c–f. Reduction in situ of compounds 1c–f in the presence of 2-methylallyloxyphosphonium salt 2 was found as a one-step synthesis of nickel allyl cationic complexes 3c–f supported by β-diimine ligands. These compounds are diamagnetic, and have been characterized by NMR and IR spectroscopic data. The structure of cationic nickel complex 3d was solved by X-ray diffraction methods.