prov:value
| - R3 is O, S, NR8, PR8 or an uncharged 2-electron donor ligand selected from the group consisting of OR8, SR8, NR8 2, PR8 2, where R8 is a hydrogen atom, a halogen atom, a C1-C40-group such as a C1-C8-alkyl group which may be halogenated, a C6-C20-aryl group which may be halogenated, a C6-C20-aryloxy group, a C2-C12-alkenyl group, a C7-C40-arylalkyl group, a C7-C40-alkylaryl group, a C8-C40-arylalke
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