4-butoxy-1,1,1-trifluorobut-3-en-2-one

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

Procedure: To a stirred solution of 2.0 g (0.0102 mol) of 4-butoxy-1,1,1-trifluoro-3-buten-2-one (VIIIa) and 1.3 g (0.0102 mol) of ethyl malonate monoamide in 10 mL methyl alcohol was added 2.2 mL (0.0102 mol) of a 25% solution of sodium methoxide in methanol. The solution turned into a thick yellow suspension which was refluxed overnight. The suspension was cooled to room temperature, poured into water, acidified with one normal hydrochloric acid and extracted with methylene chloride. The combined organic layers were washed with brine, dried over magnesium sulfate and evaporated to afford 1.7 g (74%) of a yellow solid. m.p. 63°-64° C.; 1H NMR (CDCl3) δ4.0 (3H, s), 7.33 (1H, d, J=8 Hz), 8.4 (1H, d, J=8 Hz); IR (mineral oil) 3080, 1675 (br), 1605, 1450, 1375 cm-1. was refluxed overnight extracted with methylene chloride The combined organic layers were washed with brine dried over magnesium sulfate evaporated

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

Procedure: To a stirred solution of 2.0 g (0.0102 mol) of 4-butoxy-1,1,1-trifluoro-3-buten-2-one (VIIIa) and 1.3 g (0.0102 mol) of ethyl malonate monoamide in 10 mL methyl alcohol was added 2.2 mL (0.0102 mol) of a 25% solution of sodium methoxide in methanol. The solution turned into a thick yellow suspension which was refluxed overnight. The suspension was cooled to room temperature, poured into water, acidified with one normal hydrochloric acid and extracted with methylene chloride. The combined organic layers were washed with brine, dried over magnesium sulfate and evaporated to afford 1.7 g (74%) of a yellow solid. m.p. 63°-64° C.; 1H NMR (CDCl3) δ4.0 (3H, s), 7.33 (1H, d, J=8 Hz), 8.4 (1H, d, J=8 Hz); IR (mineral oil) 3080, 1675 (br), 1605, 1450, 1375 cm-1. was refluxed overnight extracted with methylene chloride The combined organic layers were washed with brine dried over magnesium sulfate evaporated

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

Procedure: To a stirred solution of 2.0 g (0.0102 mol) of 4-butoxy-1,1,1-trifluoro-3-buten-2-one (VIIIa) and 1.3 g (0.0102 mol) of ethyl malonate monoamide in 10 mL methyl alcohol was added 2.2 mL (0.0102 mol) of a 25% solution of sodium methoxide in methanol. The solution turned into a thick yellow suspension which was refluxed overnight. The suspension was cooled to room temperature, poured into water, acidified with one normal hydrochloric acid and extracted with methylene chloride. The combined organic layers were washed with brine, dried over magnesium sulfate and evaporated to afford 1.7 g (74%) of a yellow solid. m.p. 63°-64° C.; 1H NMR (CDCl3) δ4.0 (3H, s), 7.33 (1H, d, J=8 Hz), 8.4 (1H, d, J=8 Hz); IR (mineral oil) 3080, 1675 (br), 1605, 1450, 1375 cm-1. was refluxed overnight extracted with methylene chloride The combined organic layers were washed with brine dried over magnesium sulfate evaporated

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

Procedure: To a stirred solution of 2.0 g (0.0102 mol) of 4-butoxy-1,1,1-trifluoro-3-buten-2-one (VIIIa) and 1.3 g (0.0102 mol) of ethyl malonate monoamide in 10 mL methyl alcohol was added 2.2 mL (0.0102 mol) of a 25% solution of sodium methoxide in methanol. The solution turned into a thick yellow suspension which was refluxed overnight. The suspension was cooled to room temperature, poured into water, acidified with one normal hydrochloric acid and extracted with methylene chloride. The combined organic layers were washed with brine, dried over magnesium sulfate and evaporated to afford 1.7 g (74%) of a yellow solid. m.p. 63°-64° C.; 1H NMR (CDCl3) δ4.0 (3H, s), 7.33 (1H, d, J=8 Hz), 8.4 (1H, d, J=8 Hz); IR (mineral oil) 3080, 1675 (br), 1605, 1450, 1375 cm-1. was refluxed overnight extracted with methylene chloride The combined organic layers were washed with brine dried over magnesium sulfate evaporated

Conditions: temp:-20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 8.0 g (0.05 mole) of bromine, dissolved in 100 ml pentane, are added dropwise to a solution of 9.75 g (0.05 mol) of 4-n-butoxy-1,1,1-trifluorobut-3-en-2-one in 50 ml of pentane cooled to -20° C. After stirring for 1 hour at -20° C., a solution of 6.0 g (0.06 mole) of triethylamine in 100 ml pentane is added dropwise at the same temperature. After being allowed to stand overnight at 25° C., the mixture is poured into ice water and acidified by means of 1N hydrochloric acid and the phases are separated. Conventional work-up gives 12.1 g of almost homogeneous crude 3-bromo-4-n-butoxy-1,1,1-trifluorobut-3-en-2-one, which is freed from the small amount of impurities by distillation under reduced pressure. Boiling point 113°-115° C./16 mbar, nD20 =1.4640. to stand overnight at 25° C. the phases are separated

Conditions: temp:-20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 8.0 g (0.05 mole) of bromine, dissolved in 100 ml pentane, are added dropwise to a solution of 9.75 g (0.05 mol) of 4-n-butoxy-1,1,1-trifluorobut-3-en-2-one in 50 ml of pentane cooled to -20° C. After stirring for 1 hour at -20° C., a solution of 6.0 g (0.06 mole) of triethylamine in 100 ml pentane is added dropwise at the same temperature. After being allowed to stand overnight at 25° C., the mixture is poured into ice water and acidified by means of 1N hydrochloric acid and the phases are separated. Conventional work-up gives 12.1 g of almost homogeneous crude 3-bromo-4-n-butoxy-1,1,1-trifluorobut-3-en-2-one, which is freed from the small amount of impurities by distillation under reduced pressure. Boiling point 113°-115° C./16 mbar, nD20 =1.4640. to stand overnight at 25° C. the phases are separated

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 28.0 g (0.22 mole) of sulphuryl chloride in 60 ml of dichloromethane are added dropwise with stirring to 39.0 g (0.2 mole) of 4-n-butoxy-1,1,1-trifluoro-but-3-en-2-one in 200 ml of dichloromethane at 0° C. After stirring for 4 hours at 0° C., the solvent and unreacted sulphuryl chloride are distilled off and the residue is distilled slowly under reduced pressure. 42.5 g of pale yellow 4-n-butoxy-3-chloro-1,1,1-trifluorobut-3-en-2-one of boiling point 105°-106° C./12 mbar, nD20 =1.4484 are obtained. the solvent and unreacted sulphuryl chloride are distilled off the residue is distilled slowly under reduced pressure

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 28.0 g (0.22 mole) of sulphuryl chloride in 60 ml of dichloromethane are added dropwise with stirring to 39.0 g (0.2 mole) of 4-n-butoxy-1,1,1-trifluoro-but-3-en-2-one in 200 ml of dichloromethane at 0° C. After stirring for 4 hours at 0° C., the solvent and unreacted sulphuryl chloride are distilled off and the residue is distilled slowly under reduced pressure. 42.5 g of pale yellow 4-n-butoxy-3-chloro-1,1,1-trifluorobut-3-en-2-one of boiling point 105°-106° C./12 mbar, nD20 =1.4484 are obtained. the solvent and unreacted sulphuryl chloride are distilled off the residue is distilled slowly under reduced pressure

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

Procedure: To a stirred solution of 2.0 g (0.0102 mol) of 4-butoxy-1,1,1-trifluoro-3-buten-2-one (VIIIa) and 1.3 g (0.0102 mol) of ethyl malonate monoamide in 10 mL methyl alcohol was added 2.2 mL (0.0102 mol) of a 25% solution of sodium methoxide in methanol. The solution turned into a thick yellow suspension which was refluxed overnight. The suspension was cooled to room temperature, poured into water, acidified with one normal hydrochloric acid and extracted with methylene chloride. The combined organic layers were washed with brine, dried over magnesium sulfate and evaporated to afford 1.7 g (74%) of a yellow solid. m.p. 63°-64° C.; 1H NMR (CDCl3) δ4.0 (3H, s), 7.33 (1H, d, J=8 Hz), 8.4 (1H, d, J=8 Hz); IR (mineral oil) 3080, 1675 (br), 1605, 1450, 1375 cm-1. was refluxed overnight extracted with methylene chloride The combined organic layers were washed with brine dried over magnesium sulfate evaporated