prov:value
| - C5H5-yR??????y???(IV) wherein R?????? is selected for example from the group of linear or branched C1-C10 alkyl groups, preferably C1-C6 alkyl groups, in particular methyl (???CH3), ethyl, propyl, butyl, pentyl, and an alkyl having a longer carbon chain, alkoxy, aryl, amino, cyano and silyl group, and y is an integer 1-5, and B is a neutral adduct ligand, which binds to the center atom from one or
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