| http://www.w3.org/ns/prov#value | - A suitable base for the reaction is, for example, an alkali or alkaline earth metal carbonate, (1-4C)alkoxide, (1-4C)alkanoate, hydroxide or hydride, for example sodium carbonate, potassium carbonate, barium carbonate, sodium ethoxide, potassium butoxide, sodium acetate, sodium hydroxide, potassium hydroxide, sodium hydride or potassium hydride.
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