ethyl 4-bromo-2,2-dimethyl-3-oxobutanoate

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 316 g (2 mol) of 4-bromo-2,2-dimethyl-3-keto-butanoic acid ethyl ester were added dropwise, at 30° C., to 246 g (2 mol) of 4-chlorophenol and 210 g of potassium carbonate in 1,000 ml of dimethylformamide. The mixture was stirred for 20 hours at room temperature and 2 hours at 40° C. The reaction mixture was then introduced into 2,000 ml of water. The aqueous phase was extracted by shaking twice with 500 ml of methylene chloride at a time and the organic phase was extracted by shaking twice with 250 ml of water each time. The combined organic phases were dried, concentrated and distilled. 324 g (56% of theory) of 4-(4-chlorophenoxy)-2,2-dimethyl-3-keto-butanoic acid ethyl ester of melting point 125-135° C./0.1 mm Hg were obtained. The aqueous phase was extracted by shaking twice with 500 ml of methylene chloride at a time the organic phase was extracted by shaking twice with 250 ml of water each time The combined organic phases were dried concentrated distilled

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 316 g (2 mol) of 4-bromo-2,2-dimethyl-3-keto-butanoic acid ethyl ester were added dropwise, at 30° C., to 246 g (2 mol) of 4-chlorophenol and 210 g of potassium carbonate in 1,000 ml of dimethylformamide. The mixture was stirred for 20 hours at room temperature and 2 hours at 40° C. The reaction mixture was then introduced into 2,000 ml of water. The aqueous phase was extracted by shaking twice with 500 ml of methylene chloride at a time and the organic phase was extracted by shaking twice with 250 ml of water each time. The combined organic phases were dried, concentrated and distilled. 324 g (56% of theory) of 4-(4-chlorophenoxy)-2,2-dimethyl-3-keto-butanoic acid ethyl ester of melting point 125-135° C./0.1 mm Hg were obtained. The aqueous phase was extracted by shaking twice with 500 ml of methylene chloride at a time the organic phase was extracted by shaking twice with 250 ml of water each time The combined organic phases were dried concentrated distilled

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 316 g (2 mol) of 4-bromo-2,2-dimethyl-3-keto-butanoic acid ethyl ester were added dropwise, at 30° C., to 246 g (2 mol) of 4-chlorophenol and 210 g of potassium carbonate in 1,000 ml of dimethylformamide. The mixture was stirred for 20 hours at room temperature and 2 hours at 40° C. The reaction mixture was then introduced into 2,000 ml of water. The aqueous phase was extracted by shaking twice with 500 ml of methylene chloride at a time and the organic phase was extracted by shaking twice with 250 ml of water each time. The combined organic phases were dried, concentrated and distilled. 324 g (56% of theory) of 4-(4-chlorophenoxy)-2,2-dimethyl-3-keto-butanoic acid ethyl ester of melting point 125-135° C./0.1 mm Hg were obtained. The aqueous phase was extracted by shaking twice with 500 ml of methylene chloride at a time the organic phase was extracted by shaking twice with 250 ml of water each time The combined organic phases were dried concentrated distilled