| http://www.w3.org/ns/prov#value | - X, same or different, are monovalent anionic moieties having up to 30 non-hydrogen atoms provided that, if X is an aromatic group, it is not bonded to Ti through a ??-bond, optionally two X groups being covalently bonded together to form a divalent dianionic moiety having both valences bonded to Ti; and optionally with an activating cocatalyst;
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