1-(4-chlorophenyl)prop-2-en-1-one

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

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

Procedure: The starting material may be prepared as follows: 17.7 g of ethyl trimethylsilyl(diethoxymethyl)phosphonite is added dropwise to a stirred solution of 11.7 g of 4-chlorophenyl vinyl ketone under an atmosphere of nitrogen, at room temperature. The reaction mixture is stirred for a period of 1 hour, 25 ml of chloroform is added followed by 10 ml of water and this mixture is vigorously stirred for a period of 0.5 h. The organic layer is then separated, dried over magnesium sulphate and concentrated under reduced pressure to give ethyl 2-4-chlorobenzoyl-ethyl(diethoxymethyl)phosphinate as an oil, 31P=+45.5 ppm (CDCl3). The starting material may be prepared this mixture is vigorously stirred for a period of 0.5 h The organic layer is then separated dried over magnesium sulphate concentrated under reduced pressure

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

Procedure: The starting material may be prepared as follows: 17.7 g of ethyl trimethylsilyl(diethoxymethyl)phosphonite is added dropwise to a stirred solution of 11.7 g of 4-chlorophenyl vinyl ketone under an atmosphere of nitrogen, at room temperature. The reaction mixture is stirred for a period of 1 hour, 25 ml of chloroform is added followed by 10 ml of water and this mixture is vigorously stirred for a period of 0.5 h. The organic layer is then separated, dried over magnesium sulphate and concentrated under reduced pressure to give ethyl 2-4-chlorobenzoyl-ethyl(diethoxymethyl)phosphinate as an oil, 31P=+45.5 ppm (CDCl3). The starting material may be prepared this mixture is vigorously stirred for a period of 0.5 h The organic layer is then separated dried over magnesium sulphate concentrated under reduced pressure

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

Procedure: 17.7 g of ethyl trimethylsilyl(diethoxymethyl)phosphonite is added dropwise to a stirred solution of 11.7 g of 4-chlorophenyl vinyl ketone under an atmosphere of nitrogen, at room temperature. The reaction mixture is stirred for a period of 1 hour, 25 ml of chloroform is added followed by 10 ml of water and this mixture is vigorously stirred for a period of 0.5 h. The organic layer is then separated, dried over magnesium sulphate and concentrated under reduced pressure to give ethyl 2-4-chlorobenzoyl-ethyl(diethoxymethyl)phosphinate as an oil, 31P=+45.5 ppm (CDCl3). this mixture is vigorously stirred for a period of 0.5 h The organic layer is then separated dried over magnesium sulphate concentrated under reduced pressure

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

Procedure: The starting material may be prepared as follows: 17.7 g of ethyl trimethylsilyl(diethoxymethyl)phosphonite is added dropwise to a stirred solution of 11.7 g of 4-chlorophenyl vinyl ketone under an atmosphere of nitrogen, at room temperature. The reaction mixture is stirred for a period of 1 hour, 25 ml of chloroform is added followed by 10 ml of water and this mixture is vigorously stirred for a period of 0.5 h. The organic layer is then separated, dried over magnesium sulphate and concentrated under reduced pressure to give ethyl 2-4-chlorobenzoyl-ethyl(diethoxymethyl)phosphinate as an oil, 31P=+45.5 ppm (CDCl3). The starting material may be prepared this mixture is vigorously stirred for a period of 0.5 h The organic layer is then separated dried over magnesium sulphate concentrated under reduced pressure

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

Procedure: The starting material may be prepared as follows: 17.7 g of ethyl trimethylsilyl(diethoxymethyl)phosphonite is added dropwise to a stirred solution of 11.7 g of 4-chlorophenyl vinyl ketone under an atmosphere of nitrogen, at room temperature. The reaction mixture is stirred for a period of 1 hour, 25 ml of chloroform is added followed by 10 ml of water and this mixture is vigorously stirred for a period of 0.5 h. The organic layer is then separated, dried over magnesium sulphate and concentrated under reduced pressure to give ethyl 2-4-chlorobenzoyl-ethyl(diethoxymethyl)phosphinate as an oil, 31P=+45.5 ppm (CDCl3). The starting material may be prepared this mixture is vigorously stirred for a period of 0.5 h The organic layer is then separated dried over magnesium sulphate concentrated under reduced pressure

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

Procedure: 17.7 g of ethyl trimethylsilyl(diethoxymethyl)phosphonite is added dropwise to a stirred solution of 11.7 g of 4-chlorophenyl vinyl ketone under an atmosphere of nitrogen, at room temperature. The reaction mixture is stirred for a period of 1 hour, 25 ml of chloroform is added followed by 10 ml of water and this mixture is vigorously stirred for a period of 0.5 h. The organic layer is then separated, dried over magnesium sulphate and concentrated under reduced pressure to give ethyl 2-4-chlorobenzoyl-ethyl(diethoxymethyl)phosphinate as an oil, 31P=+45.5 ppm (CDCl3). this mixture is vigorously stirred for a period of 0.5 h The organic layer is then separated dried over magnesium sulphate concentrated under reduced pressure

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

Procedure: 17.7 g of ethyl trimethylsilyl(diethoxymethyl)phosphonite is added dropwise to a stirred solution of 11.7 g of 4-chlorophenyl vinyl ketone under an atmosphere of nitrogen, at room temperature. The reaction mixture is stirred for a period of 1 hour, 25 ml of chloroform is added followed by 10 ml of water and this mixture is vigorously stirred for a period of 0.5 h. The organic layer is then separated, dried over magnesium sulphate and concentrated under reduced pressure to give ethyl 2-4-chlorobenzoyl-ethyl(diethoxymethyl)phosphinate as an oil, 31P=+45.5 ppm (CDCl3). this mixture is vigorously stirred for a period of 0.5 h The organic layer is then separated dried over magnesium sulphate concentrated under reduced pressure

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

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

Procedure: Under argon, 91 g (546 mmol) of 1-(4-chlorophenyl)prop-2-en-1-one, 2.293 g (54.6 mmol) of sodium fluoride and 2.41 g (10.92 mmol) of 2,6-di-tert-butyl 4-methylphenol were heated in a 3 liter three-necked flask to 110° C. and stirred at this temperature for 5 min. At an internal temperature of 110°-125° C., 183 ml (928.5 mmol) of trimethylsilyl 2,2-difluoro-2-(fluorosulphonyl)acetate were then slowly added dropwise over a period of 30-35 min to the solution (careful: evolution of gas). After the addition and the evolution of gas had ended, the reaction solution was stirred for another 20 min. After cooling, the reaction mixture was taken up in several liters of ethyl acetate and extracted with saturated aqueous sodium bicarbonate solution. The phases were separated, the organic phase was then dried over magnesium sulphate and filtered and the filtrate was concentrated to dryness. The crude product obtained was purified by chromatography on silica gel (about 2 kg) (mobile phase cyclohexane/ethyl acetate 10:1). This gave 63 g of the target product (53% of theory). After the addition the reaction solution was stirred for another 20 min After cooling extracted with saturated aqueous sodium bicarbonate solution The phases were separated the organic phase was then dried over magnesium sulphate filtered the filtrate was concentrated to dryness

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

Procedure: Under argon, 91 g (546 mmol) of 1-(4-chlorophenyl)prop-2-en-1-one, 2.293 g (54.6 mmol) of sodium fluoride and 2.41 g (10.92 mmol) of 2,6-di-tert-butyl 4-methylphenol were heated in a 3 liter three-necked flask to 110° C. and stirred at this temperature for 5 min. At an internal temperature of 110°-125° C., 183 ml (928.5 mmol) of trimethylsilyl 2,2-difluoro-2-(fluorosulphonyl)acetate were then slowly added dropwise over a period of 30-35 min to the solution (careful: evolution of gas). After the addition and the evolution of gas had ended, the reaction solution was stirred for another 20 min. After cooling, the reaction mixture was taken up in several liters of ethyl acetate and extracted with saturated aqueous sodium bicarbonate solution. The phases were separated, the organic phase was then dried over magnesium sulphate and filtered and the filtrate was concentrated to dryness. The crude product obtained was purified by chromatography on silica gel (about 2 kg) (mobile phase cyclohexane/ethyl acetate 10:1). This gave 63 g of the target product (53% of theory). After the addition the reaction solution was stirred for another 20 min After cooling extracted with saturated aqueous sodium bicarbonate solution The phases were separated the organic phase was then dried over magnesium sulphate filtered the filtrate was concentrated to dryness

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

Procedure: 17.7 g of ethyl trimethylsilyl(diethoxymethyl)phosphonite is added dropwise to a stirred solution of 11.7 g of 4-chlorophenyl vinyl ketone under an atmosphere of nitrogen, at room temperature. The reaction mixture is stirred for a period of 1 hour, 25 ml of chloroform is added followed by 10 ml of water and this mixture is vigorously stirred for a period of 0.5 h. The organic layer is then separated, dried over magnesium sulphate and concentrated under reduced pressure to give ethyl 2-4-chlorobenzoyl-ethyl(diethoxymethyl)phosphinate as an oil, 31P=+45.5 ppm (CDCl3). this mixture is vigorously stirred for a period of 0.5 h The organic layer is then separated dried over magnesium sulphate concentrated under reduced pressure