Willgerodt reaction

noun

: a reaction usually of an aryl alkyl ketone ArCO(CH₂)_n H (as acetophenone) with an aqueous solution of yellow ammonium polysulfide in a heated sealed tube to yield an amide Ar(CH₂)_{n −1}CONH₂ (as alpha-phenyl-acetamide) substituted terminally by aryl

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