| http://www.w3.org/ns/prov#value | - The Al-alkyl compounds useful as cocatalysts include Al-trialkyls, such as Al-triethyl, Al-triisopropyl and Al-triisobutyl; Al-dialkyl (C1-6 alkyl) hydrides, such as Al-diethyl hydride; and compounds containing two or more Al atoms linked to each other through oxygen, nitrogen and/or sulfur heteroatoms, such as: ##STR2## where n is a number between 1 and 20.
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