“…The authors proposed that the inclusion of 1,5cyclooctadiene (L7, COD) results in (L7)Ni(I)X Ni-8 (X = I, Br), 69 the identity of which has been recently supported by the isolation of [(COD)Ni-Br] 2 and [(L7) 2 Ni][Al(ORF) 4 ] Ni-9 (ORF = OC(CF 3 ) 3 ). 70,71 Introduction to anionic ligand disproportionation In situ reduction by anionic ligand disproportionation has been a widely reported method to access Ni(0) and Ni(II) species from R-Ni(II)X organometallic complexes (R = allyl, aryl, alkyl) which then can react by comproportionation to afford Ni(I) complexes. Alternatively, such Ni(I) intermediates can be accessed via oxidative addition of an organic halide to Ni(0)L n given that after ligand disproportionation and reductive elimination, Ni(0) and Ni(II) species are generated in equimolar ratios.…”