Homocoupling of aryl iodides promoted by nickel(0) nanoparticles

Abstract

Nickel(0) nanoparticles generated by the reduction of anhydrous NiCl 2 with Li and a catalytic amount of a polymer-supported arene have been found to promote the homocoupling of aryl iodides, in the presence or absence of a ligand, under relatively mild reaction conditions.

Biradical o-iminobenzosemiquinonato(1−) complexes of nickel(ii): catalytic activity in three-component coupling of aldehydes, amines and alkynes

“…Alternatively, Ni II complexes are more convenient as pre-catalysts in terms of their availability and easy handling. Nevertheless, these Ni II catalysts should be activated in situ with some additives 19 such as base, I 2 or PPh 3 or used as bimetallic systems of Ni( ii )/M(Zn(0), Mn(0), Cu( i ), Ag( i ). In some cases, Ni complex itself can act as the active catalyst ( Table 10 , entry 1) 19 a by cleavage of one of the oxo bridges of the ligand and generating an initial nickel( ii ) acetylide intermediate in A 3 -coupling reactions.…”