| http://www.w3.org/ns/prov#value | - The process as claimed in claim 1, wherein at least one polycyclic olefin is of the formulas I or III, in which R1, R2, R3, R4, R5, R6, R7 and R8 are identical or different and are a hydrogen atom, a C6 -C10 -aryl radical or a C1 -C8 -alkyl radical where the same radicals can have different meaning in the various formulas.
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