| http://www.w3.org/ns/prov#value | - Any base that is not involved in the reaction may be used as the base used in this case, and the reaction can be carried out, for example, in the presence of alkali metal alkoxides such as sodium methoxide and sodium ethoxide, alkali metal hydrides such as sodium hydride and potassium hydride, alkali metal organic bases such as n-butyllithium, lithium diisopropylamide, lithium bis(trimethylsilyl)a
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