AbstractThe catalytic activities of various copper(I) clusters in the oxidation of 2,6‐dimethylphenol (XOH) in pyridine and the preparative oxidative polymerization of XOH with these complexes were investigated. It was found that the copper(I) cluster containing 1,2‐dicyano‐1,2‐ethenedithiolate ligands is more effective in the oxidative polymerization of XOH than the complex containing isomeric ligands. The electric conductivities of these Cu(I) complexes ar