| http://www.w3.org/ns/prov#value | - cording to a) is carried out in the presence of a basic agent, preferably a tertiary aliphatic amine such as, for example, triethylamine, in a solvent which is preferably tetrahydrofuran or alternatively an aromatic hydrocarbon such as, for example, benzene or an alkylbenzene such as toluene or xylene, or else a halogenated solvent such as chloroform or methylene chloride, and preferably at the bo
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