| http://www.w3.org/ns/prov#value | - The reaction may be effected in the presence of a base such as alkalis like sodium hydroxide, potassium hydroxide and the like, alkali metal carbonates like sodium carbonate, potassium carbonate and the like; alkali metal hydrides such as sodium hydride, potassium hydrides and the like; organometallic bases like n-butyl lithium, alkali metal amides like sodamide or mixtures thereof.
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