| http://www.w3.org/ns/prov#value | - The reaction mentioned above is carried out at a temperature of 50??? C. to 250??? C. in a lactone solvent such as ??-butyrolactone or the like, an amide solvent such as N-methylpyrrolidone (NMP), dimethylformamide (DMF) or the like, a sulfone solvent such as tetramethylene sulfone or the like, or an ethereal solvent such as diethylene glycol dimethyl ether or the like.
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