| http://www.w3.org/ns/prov#value | - sociated therewith can be joined together to form a ring containing from 4 to about 20 carbon atoms, R3 is a bridging group, n is 0, 1, 2 or 3, M is a transition metal having a valence of from 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, Y is a heteroatom containing group in which the heteroatom is an elemen
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