prov:value
| - Preferred bases to be used from amongst the above are alkali metal compounds of lithium, sodium and potassium, for example metal alkyls, e.g. butyllithium, alcoholates, e.g. sodium methanolate, sodium ethanolate and potassium tert.-butanolate, metal amides, e.g. lithium diisopropylamide, alkali metal hydroxides, e.g. sodium hydroxide and potassium hydroxide, and quaternary ammonium compounds, e.g.
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