prov:value
| - d are hydrogen, a C1 -C10 -alkyl group, a C1 -C10 -alkoxy group, a C6 -C10 -aryl group, a C6 -C10 -aryloxy group, a C2 -C10 -alkenyl group, a C7 -C40 -arylalkyl group, a C7 -C40 -alkylaryl group, a C8 -C40 -aryl-alkenyl group, an OH group, a halogen atom or pseudohalogen, L and L' are identical or different and are a II ligand or another electron donor, k is 2 if B1 is ##STR16## and k is an intege
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