prov:value
| - actions, or other solvents such as nitromethane, dimethylformamide, dimethylacetamide, 1,2-dimethoxyethane, dimethyl sulphoxide, acetonitrile, diethylphenylamine or pyridine, those preferred are pyridine, trichloromethane, diethylphenylamine, dioxane or acetonitrile, optionally in the presence of a base, such as for example alkali metal carbonates such as caesium carbonate, sodium or potassium car
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