prov:value
| - ing 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, preferably from Group 4, 5, or 6 of the Periodic Table of the Elements and is preferably in its highest oxidation state, each X is a non-c
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