prov:value
| - L1 can be identical or different and are each a hydrogen atom, a C1-C20-hydrocarbon radical such as C1-C10-alkyl or C6-C20-aryl, a halogen atom or OR6, SR6, OSiR3 6, SiR3 6, PR2 6 or NR2 6, where R6 is a halogen atom, C1-C10-alkyl group, a halogenated C1-C10-alkyl group, a C6-C20-aryl group or a halogenated C6-C20-aryl group, or L1 is a toluenesulfonyl, trifluoroacetyl, trifluoroacetoxyl, trifluor
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