| http://www.w3.org/ns/prov#value | - wherein (C5 R'k) is a cyclopentadienyl or substituted cyclopentadienyl, each R' is the same or different and is hydrogen or a hydrocarbyl radical such as alkyl, alkenyl, aryl, alkylaryl, or arylalkyl radical containing from 1 to 20 carbon atoms or two carbon atoms are joined together to form a C4 -C6 ring, R is a C1 -C4 alkylene radical, a dialkyl germanium or silicon, or a alkyl phosphine or ami
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