| prov:value
| - M is titanium, zirconium or hafnium, R9 and R10 are identical or different and are each a hydrogen atom, hydroxy or a halogen atom or a C1-C40-group such as C1-C10-alkyl, C1-C10-alkoxy, C6-C10-aryl, C6-C10-aryloxy, C2-C10-alkenyl, C7-C40-arylalkyl, C7-C40-alkylaryl, C8-C40-arylalkenyl, preferably hydrogen, C1-C3-alkyl, in particular methyl, C1-C3-alkoxy, C6-aryl, C6-aryloxy, C2-C10-alkenyl, C7-C10
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