| http://www.w3.org/ns/prov#value | - The catalyst may be activated (or pre-activated) with an appropriate activator (cocatalyst) including alumoxane compounds, modified alumoxane compounds, and ionizing anion precursor compounds that abstract one reactive, ??-bound, metal ligand making the metal complex cationic and providing a charge-balancing noncoordinating or weakly coordinating anion such as methylalumoxane (MAO) and N,N-dimethy
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