Development of new polymerization catalysts with manganese(II) complexes

Many transition metal catalysts including both early and late transition metal ions have been investigated for olefin polymerization and copolymerization reactions. Less attention has been paid to group 7 metal catalysts. Yet, manganese(II)-based catalysts are expected to have features distinct from early and late transition metal catalysts. In this context, the present review summarizes our recent results and strategy about ethylene polymerization and ethylene copolymerization with 1-hexene with manganese(II)-based catalysts.

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► We review our recent results and strategy about ethylene polymerization with Mn(II)-based catalysts.
► The catalytic activity depends on the sterically hindrances in the ligands.
► From these crowded situation in the active species, we obtained isospecific polypropylene products.
► Some anionic alkyl species was inserted in the vacant site of these Mn(II) catalysts during catalytic reaction.