| http://www.w3.org/ns/prov#value | - The reaction can be carried out at a temperature of about 0??? to about 100??? C., preferably 20??? to 80??? C., in the absence of solvents, but advantageously carried out in the presence of solvents, e.g., alcohols such as methanol, ethanol, propanol, isopropanol and the like, aromatic hydrocarbons such as benzene, toluene, xylene and the like, water, etc., preferably alcohols such as methanol, e
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