| http://www.w3.org/ns/prov#value | - The reaction is preferably performed in the presence of a solvent, and the solvent to be preferably employed is, for example, an alcohol such as methanol, ethanol, tert-butanol and the like, an aliphatic carboxylic acid dialkyl amide such as dimethyl formamide, dimethyl sulfoxide, an ether such as tetrahydrofuran, dioxane, 1,2-dimethoxyethane and the like.
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