| prov:value
| - lkyl, aryl, alkylaryl or arylalkyl radical, to form the bridge, e.g., R may be n-propyl or isopropyl in that it can be three linear carbon atoms or one branched carbon atom with methyl groups attached; Q is a hydrocarbyl radical such as an alkyl, aryl, alkenyl, alkylaryl or arylalkyl radical having 1-20 carbon atoms or is a halogen; Me is a Group IIIB, IVB, VB, or VIB metal as positioned in the P
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