| http://www.w3.org/ns/prov#value | - ilylamido, alkoxy, siloxy, aminosilylalkyl, or analogous monodentate hetero atom electron donating groups; M is a d- or f-block metal atom; each L is, independently, a leaving group that is bonded to the d- or f-block metal atom and is capable of forming a stable co-product on interaction with a proton from a hydroxyaluminoxane; X is a group other than a leaving group that is bonded to the d- or f
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