3-chloro-N-ethyl-4-fluoroaniline

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 3-chloro-N-ethyl-4-fluoroaniline (97.4 g, 0.56 mmol) in glacial acetic acid (225 ml) is treated at 5° with acetic anhydride (105 ml, 1.12 mol). The solution is stirred for one hour, then poured on to ice/water (250 ml) and extracted with ethyl acetate (2×200 ml). The combined phases are washed in succession with water (100 ml), 2N sodium hydroxide solution (100 ml), saturated sodium bicarbonate solution (100 ml), water (10 ml) and 10 percent sodium chloride solution (100 ml). The solution is dried over magnesium sulfate and evaporated. The residue is recrystallized from n-hexane. There are obtained 102 g (84.2%) of 3'-chloro-N-ethyl-4'-fluoroacetanilide. extracted with ethyl acetate (2×200 ml) The combined phases are washed in succession with water (100 ml), 2N sodium hydroxide solution (100 ml), saturated sodium bicarbonate solution (100 ml), water (10 ml) and 10 percent sodium chloride solution (100 ml) The solution is dried over magnesium sulfate evaporated The residue is recrystallized from n-hexane

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of lithium aluminium hydride (44.1 g, 1.16 mmol) in absolute ether (700 ml) is treated dropwise with a solution of 3'-chloro-4'-fluoroacetanilide (BE Patent No. 891537; 109 g, 0.576 mol) in absolute THF (350 ml). The suspension obtained is stirred for 2 hours, then cooled to 0° and treated with a Rochelle salt solution (350 ml). The crystals obtained are filtered off and washed with ether. The organic solution is dried over magnesium sulphate and the solvent is distilled off under reduced pressure. There are obtained 97.5 g (97.5%) of 3-chloro-N-ethyl-4-fluoroaniline as an amorphous material. The suspension obtained cooled to 0° The crystals obtained are filtered off washed with ether The organic solution is dried over magnesium sulphate the solvent is distilled off under reduced pressure