| http://www.w3.org/ns/prov#value | - R1 is preferably 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, preferably perhalogenated, C1-C30-alkyl group, such as trifluoromethyl, pentachloroethyl, heptafluoroisopropyl or monofluoroisobutyl, or a halogenated, preferably perhalogenated, C6-C30-aryl group, suc
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