Hydrochloric Acid → Diethyl (2,6-Dichloro-4-fluoro-phenyl)-malonate

Participants

Reaction Conditions

Reaction Steps

Diethyl malonate (0.49 mol) is added to a mixture of sodium hydride (0.51 mol) and 1,4-dioxane (140 ml) at 55 to 60° C. within 2 hours. The mixture is stirred for 10 minutes at 55° C. and copper(I) bromide (0.05 mol) is added. After 15 minutes a mixture of 1-bromo-2,6-dichloro-4-fluoro-benzene (0.25 mol) and 1,4-dioxane (10 ml) is added. The reaction mixture is heated at 100° C. for 15 hours and cooled to 15° C. Hydrochloric acid (12N, 35 ml) is added slowly at 15 to 20° C. The precipitate is filtered off. The filtrate is extracted with diethylether. The organic phase is separated, dried with anhydrous sodium sulphate and filtered. The filtrate is evaporated under reduced pressure to yield 44 g of the product as yellow crystals having a melting point of 170° C.

Provenance & Evidence