prov:value
| - 1 and/or R2 substituents on adjacent carbon atoms of the cyclopentadienyl ring associated there with can be joined together to form a ring containing from 4 to about 20 carbon atoms, R3 is a bridging group, n is the number of atoms in the direct chain between the two ligands and is 0, 1, 2, 3, 4, 5, 6, 7, or 8, preferably 0, 1, 2, or 3, M is a transition metal having a valence of 3, 4, 5 or 6, pre
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