| http://www.w3.org/ns/prov#value | - A metallocene compound of the formula XI ##STR23## in which M1 is titanium, zirconium or hafniumR14 and R15 are identical or different and are a hydrogen atom, a halogen atom, a C1 -C10 -alkyl group, a C1 -C10 -alkoxy group, a C6 -C10 -aryl group, a C6 -C10 -aryloxy group, a C2 -C10 -alkenyl group, a C7 -C40 -arylalkyl group or a C8 -C40 -arylalkenyl group, R16 is a fluoroenyl group bearing one or
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