| http://www.w3.org/ns/prov#value | - The most preferred solvent is methanol. [0212] The basic catalyst employed is, for example, an alkali metal hydroxide such as sodium hydroxide and potassium hydoxide; an alkali metal carbonate such as sodium carbonate and potassium carbonate; an alkali metal alkoxide such as sodium methoxide and sodium ethoxide; or aqueous ammonia solution and the like.
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