| http://www.w3.org/ns/prov#value | - The reaction is preferably carried out in a solvent, in particular a polar aprotic solvent, such as dimethylformamide, dimethyl sulfoxide, N-methylpyrrolidone, dimethylacetamide, an ether, such as diethyl ether, tetrahydrofuran or dioxane, and mixtures of these solvents.
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