Ethane, 1-chloro-1-ethoxy- → 4,5-Dichloro-2-(3,4-dichlorophenyl)-1-(1-ethoxyethyl)pyrrole-3-carbonitril

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Reaction Steps

To 4,5-dichloro-2-(3,4-dichlorophenyl)-pyrrole-3-carbonitrile (5.0 g, 0.016 mol) dissolved in 300 mL of tetrahydrofuran is added, portionwise, potassium t-butoxide (2.75 g, 0.025 mol) with ice cooling and stirring. The cooled mixture is treated with a solution of 1-chloroethyl ethyl ether (2.31 g, 0.021 mol) in 15 mL of tetrahydrofuran at 10° C. over a 5 minute period. The mixture is stirred for 1/2 hour at ambient temperatures, evaporated to a volume of 50 mL and poured into a mixture of 200 mL of ethyl acetate and 100 mL of water. The organic layer is separated, washed with water (2×100 mL), saturated NaCl solution (1×100 mL), dried over anhydrous magnesium sulfate and evaporated to give the title product 5.9 g, mp 124°-126° C.

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