| http://www.w3.org/ns/prov#value | - As nucleofuges, chloride, bromide, iodide, mesylate, tosylate or triflate can be mentioned.The reaction is carried out in solvents such as chloroform methylene chloride, tetrahydrofuran, dioxane, dimethylformamide, dimethyl sulfoxide or else in water at temperatures of 0.degree.
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