Ethanol → (1-Benzyl-4-phenylpiperidine-4-carbonyl)-oxidoazanium

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4-Phenyl-4-cyano-1-benzyl-piperidine (535 g, 1940 mmol) was combined with aqueous sodium hydroxide (85 mL, 50% by weight) and ethanol (5 L) and the mixture was heated to 50° C. The heating was removed, and a solution of hydrogen peroxide (856 mL, 30% by weight in water) was added at such a rate that the temperature of the reaction mixture does not rise above 50° C. The reaction mixture was then stirred at 50° C. for 20 hours. The reaction mixture was diluted with water (3 L) and the ethanol was removed in vacuo at 35° C. Cooling the reaction mixture to ambient temperature gave a solid which was collected by filtration, rinsed with water, and air dried to give 4-phenyl-1-benzyl-piperidine-4-carboxylic acid amide N-oxide.

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