prov:value
| - M is zirconium, hafnium or titanium; X, equal to or different from each other, is a hydrogen atom, a halogen atom, a R, OR, OR???O, OSO2CF3, OCOR, SR, NR2 or PR2 group, wherein R is a linear or branched, saturated or unsaturated C1-C20-alkyl, C3-C20-cycloalkyl, C6-C20-aryl, C7-C20-alkylaryl, or C7-C20-arylalkyl radical, optionally containing one or more heteroatoms belonging to groups 13-17 of the
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