ethyl 4-chloro-2,2-dimethylbutanoate

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

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

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

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In 100 ml of dimethylformamide were dissolved 22.1 g of ethyl 4-chloro-2,2-dimethylbutyrate and 14.5 g of potassium thiocyanate and the solution was stirred at 100° C. for 7 hours. The reaction mixture was poured in 500 ml of water and extracted with ethyl ether. The extract was washed with water and dried (MgSO4) and the solvent was distilled off. The residue was subjected to vacuum distillation to provide 16.4 g of the title compound as colorless oil. b.p. 109°-111° C./0.3 mmHg extracted with ethyl ether The extract was washed with water dried (MgSO4) the solvent was distilled off The residue was subjected to vacuum distillation

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In 100 ml of dimethylformamide were dissolved 22.1 g of ethyl 4-chloro-2,2-dimethylbutyrate and 14.5 g of potassium thiocyanate and the solution was stirred at 100° C. for 7 hours. The reaction mixture was poured in 500 ml of water and extracted with ethyl ether. The extract was washed with water and dried (MgSO4) and the solvent was distilled off. The residue was subjected to vacuum distillation to provide 16.4 g of the title compound as colorless oil. b.p. 109°-111° C./0.3 mmHg extracted with ethyl ether The extract was washed with water dried (MgSO4) the solvent was distilled off The residue was subjected to vacuum distillation

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 22.2 ml of diisopropylamine in 150 ml of tetrahydrofuran was added 93.6 ml of 1.6M n-butyllithium-hexane with stirring at -5° to 0° C. and the mixture was stirred for 30 minutes. The reaction mixture was cooled to -78° C. and 19.0 ml of ethyl isobutyrate was added dropwise. The mixture was then further stirred for 45 minutes, after which a solution of 11.9 ml of 1-bromo-2-chloroethane in 10 ml of tetrahydrofuran was added dropwise. The reaction mixture was stirred at -78° C. for 1 hour and, then, at room temperature for 2 hours. After an excess amount of an aqueous solution of ammonium chloride was added, the mixture was extracted with ethyl acetate. The extract was washed with water and dried (MgSO4) and the solvent was distilled off. Finally, the residue was distilled under reduced pressure to provide 24.7 g of the title compound as colorless oil. b.p. 54°-56° C./0.25 mmHg the mixture was stirred for 30 minutes The mixture was then further stirred for 45 minutes The reaction mixture was stirred at -78° C. for 1 hour the mixture was extracted with ethyl acetate The extract was washed with water dried (MgSO4) the solvent was distilled off Finally, the residue was distilled under reduced pressure

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 22.2 ml of diisopropylamine in 150 ml of tetrahydrofuran was added 93.6 ml of 1.6M n-butyllithium-hexane with stirring at -5° to 0° C. and the mixture was stirred for 30 minutes. The reaction mixture was cooled to -78° C. and 19.0 ml of ethyl isobutyrate was added dropwise. The mixture was then further stirred for 45 minutes, after which a solution of 11.9 ml of 1-bromo-2-chloroethane in 10 ml of tetrahydrofuran was added dropwise. The reaction mixture was stirred at -78° C. for 1 hour and, then, at room temperature for 2 hours. After an excess amount of an aqueous solution of ammonium chloride was added, the mixture was extracted with ethyl acetate. The extract was washed with water and dried (MgSO4) and the solvent was distilled off. Finally, the residue was distilled under reduced pressure to provide 24.7 g of the title compound as colorless oil. b.p. 54°-56° C./0.25 mmHg the mixture was stirred for 30 minutes The mixture was then further stirred for 45 minutes The reaction mixture was stirred at -78° C. for 1 hour the mixture was extracted with ethyl acetate The extract was washed with water dried (MgSO4) the solvent was distilled off Finally, the residue was distilled under reduced pressure

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In 100 ml of dimethylformamide were dissolved 22.1 g of ethyl 4-chloro-2,2-dimethylbutyrate and 14.5 g of potassium thiocyanate and the solution was stirred at 100° C. for 7 hours. The reaction mixture was poured in 500 ml of water and extracted with ethyl ether. The extract was washed with water and dried (MgSO4) and the solvent was distilled off. The residue was subjected to vacuum distillation to provide 16.4 g of the title compound as colorless oil. b.p. 109°-111° C./0.3 mmHg extracted with ethyl ether The extract was washed with water dried (MgSO4) the solvent was distilled off The residue was subjected to vacuum distillation

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 22.2 ml of diisopropylamine in 150 ml of tetrahydrofuran was added 93.6 ml of 1.6M n-butyllithium-hexane with stirring at -5° to 0° C. and the mixture was stirred for 30 minutes. The reaction mixture was cooled to -78° C. and 19.0 ml of ethyl isobutyrate was added dropwise. The mixture was then further stirred for 45 minutes, after which a solution of 11.9 ml of 1-bromo-2-chloroethane in 10 ml of tetrahydrofuran was added dropwise. The reaction mixture was stirred at -78° C. for 1 hour and, then, at room temperature for 2 hours. After an excess amount of an aqueous solution of ammonium chloride was added, the mixture was extracted with ethyl acetate. The extract was washed with water and dried (MgSO4) and the solvent was distilled off. Finally, the residue was distilled under reduced pressure to provide 24.7 g of the title compound as colorless oil. b.p. 54°-56° C./0.25 mmHg the mixture was stirred for 30 minutes The mixture was then further stirred for 45 minutes The reaction mixture was stirred at -78° C. for 1 hour the mixture was extracted with ethyl acetate The extract was washed with water dried (MgSO4) the solvent was distilled off Finally, the residue was distilled under reduced pressure

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

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 22.1 g of ethyl 4-chloro-2,2-dimethylbutyrate and 14.5 g of potassium thiocyanate were dissolved in 100 ml of dimethylformamide, followed by stirring at 100° C. for 7 hours. The reaction mixture was added to 500 ml of water and extracted with ethyl ether. After the extract was washed with water and dried over MgSO4, the solvent was distilled off. The residue was distilled under reduced pressure to yield 16.4 g of the title compound in the form of a colorless oily substance. extracted with ethyl ether After the extract was washed with water dried over MgSO4 the solvent was distilled off The residue was distilled under reduced pressure

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 22.2 ml of diisopropylamine in 150 ml of tetrahydrofuran being stirred, 93.6 ml of a 1.6 M solution of n-butyl lithium in hexane was added at -5° to 0° C., followed by stirring for 30 minutes. After the reaction mixture was cooled to -78° C. and 19.0 ml of ethyl isobutyrate was added dropwise to the mixture and stirred for 45 minutes. A solution of 11.9 ml of 1-bromo-2-chloroethane in 10 ml of tetrahydrofuran was added dropwise to the reaction mixture. After the reaction mixture was stirred at -78° C. for 1 hour and then at roomtemperature (15° to 20° C.) for 2 hours, an excess amount of an aqueous solution of ammonium chloride was added, followed by extractionwith ethyl acetate. After the extract was washed with water and dried over MgSO4, the solvent was distilled off; the residue was then distilled under reduced pressure, to yield 24.7 g of the title compound in the form of a colorless oily substance. stirred for 45 minutes After the reaction mixture was stirred at -78° C. for 1 hour at roomtemperature (15° to 20° C.) for 2 hours followed by extractionwith ethyl acetate After the extract was washed with water dried over MgSO4 the solvent was distilled off the residue was then distilled under reduced pressure