Tributylphosphine → ethyl 3-(3-chloro-2-fluorophenyl)-2-hydrazinylidene-3-oxopropanoate

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To a solution of ethyl 3-(3-chloro-2-fluorophenyl)-2-diazo-3-oxopropanoate (1.28 g, 4.73 mmol) in dioxane (12 mL) was added tri-n-butylphosphine (1.23 mL, 4.97 mmol). After stirring for 10 minutes at ambient temperature, the mixture was concentrated in vacuo and the residue was purified by silica gel gradient chromatography (100:0 to 40:60 hexane:ethyl acetate), providing the titled compound.

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