| http://www.w3.org/ns/prov#value | - As used herein metallocene refers generally to compounds represented by the formula Cpm MRn Xq wherein Cp is a cyclopentadienyl ring which may be substituted or derivative thereof which may be substituted, M is a Group 4, 5, or 6 transition metal, for example titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten, R is a hydrocarbyl group or hydrocarboxy gro
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