| http://www.w3.org/ns/prov#value | - The preferred process for the cycloaddition reaction is in an inert solvent (e.g. methylene chloride, dioxane, tetrahydrofuran, toluene) under the influence of a suitable acid, such as trifluoroacetic acid, at temperatures ranging from -20???-30??? C. Alternatively, one can affect the cycloaddition under the influence of lithium fluoride and sonication (Padwa, vide supra).
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