To the ketone or diketone in the reaction flask, add a suitable base. The base is used to deprotonate the hydroxylamine and facilitate the oximation reaction. Sodium hydroxide (NaOH) is commonly used. The amount of base can vary but is typically in the range of 1-2 moles relative to your ketone or diketone.
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1-(α-Acetylbenzyl)-3,3-dimethyl-3,4-dihydroisoquinoline
α-[2,2,2-trifluoroethoxy]-β-[4-chlorophenylthio]-ethylbenzene
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