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A new class of air stable and structurally well-defined cobalt complexes with unsymmetrical pincer type ligands are prepared.Upon activation by methylaluminoxane (MAO) in toluene at room temperature, all complexes initiate polymerization of 1,3-butadiene (polymer yield: 65-99%), affording polybutadiene with excellent cis-l,4 regularity (97.5-98.7%).