| http://www.w3.org/ns/prov#value | - R2 is preferably a hydrogen atom, a halogen atom or a boron-free C1-C40-hydrocarbon radical, which may be halogenated, preferably perhalogenated, by halogen, such as fluorine, chlorine, bromine or iodine, in particular a halogenated, go preferably perhalogenated, C1-C30-alkyl group, such as trifluoromethyl, pentachloro-ethyl, heptafluoroisopropyl or monofluoroisobutyl, or a halogenated, preferably
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