Sulfuric Acid → N-[1-(3-Bromophenyl)ethylidene]-2,6-diisopropylaniline

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In 25 mL Claisens flask in an argon atmosphere, a mixture of 3.98 g (20.0 mmol) of 3-bromoacetophenone, 5.00 g (24.0 mmol) of Si(OEt)4, and 3.90 g (22.0 mmol) of 2,6-diisopropylaniline was heated to 170° C., and then 0.20 mL of 96% H2SO4 was added. This mixture was stirred at this temperature for 1 hr, and the formed ethanol was slowly distilled off. Later, 300 mL of cold water was added, and the product was extracted with 2×70 mL of diethyl ether. The combined extract was dried over K2CO3 and then evaporated to dryness. The product was isolated by flash-chromatography on silica gel 60 (40-63 um, eluent: from hexanes to hexanes-diethyl ether, 50:1, vol.). This procedure gave 6.30 g (88%) of 13.

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