2-chloro-1-(1-chlorocyclopropyl)ethanone

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

Procedure: 100 g (0.66 mol) of 1-chloro-cyclopropyl chloromethyl ketone in 80 ml of acetonitrile are added dropwise to a refluxing suspension of 83 g (0.6 mol) of potassium carbonate and 58 g (0.84 mol) of triazole in 330 ml of acetonitrile. The mixture is refluxed for 8 hours and then filtered off with suction and concentrated. The residue is taken up in ethyl acetate/toluene, and the mixture is washed with water, dried over sodium sulphate and concentrated. The subsequent purification by column chromatography in which dichloromethane was used as the mobile phase gave 62 g (51% of theory) of 1-(1-chlorocyclopropyl)-2-(1,2,4-triazol-1-yl)-ethan-1-one. The mixture is refluxed for 8 hours filtered off with suction concentrated the mixture is washed with water dried over sodium sulphate concentrated The subsequent purification by column chromatography in which dichloromethane

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

Procedure: 22.2 g (0.203 mole) of ethyl bromide are slowly added to 4.9 g (0.203 mole) of magnesium turnings in 100 ml of diethyl ether. After completion of the addition, the reaction mixture is heated under reflux for 30 minutes and then cooled to room temperature, and a solution of 20 g (0.185 mole) of 2-thienylethine in 50 ml of diethyl ether is subsequently added dropwise with stirring. The mixture is heated under reflux for 1 hour and again cooled to room temperature. 28.3 g (0.185 mole) of 1-chloro-cyclopropyl chloromethyl ketone are added dropwise with stirring and the mixture is then heated under reflux for a further 2 hours. After cooling to room temperature, the reaction mixture is poured into a saturated aqueous ammonium chloride solution and the mixture is extracted three times with diethyl ether. The combined organic phases are washed once with water, dried over sodium sulphate and concentrated under reduced pressure. 47.0 g (97% of theory) of 1-chloro-2-(1-chloro-cyclopropyl)-4-(thiophen-2-yl)-but-3-in-2-ol are obtained in this way in the form of an oil which is reacted further without additional purification. After completion of the addition the reaction mixture is heated under reflux for 30 minutes The mixture is heated under reflux for 1 hour again cooled to room temperature with stirring the mixture is then heated under reflux for a further 2 hours After cooling to room temperature the mixture is extracted three times with diethyl ether The combined organic phases are washed once with water dried over sodium sulphate concentrated under reduced pressure

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

Procedure: 22.2 g (0.203 mole) of ethyl bromide are slowly added to 4.9 g (0.203 mole) of magnesium turnings in 100 ml of diethyl ether. After completion of the addition, the reaction mixture is heated under reflux for 30 minutes and then cooled to room temperature, and a solution of 20 g (0.185 mole) of 2-thienylethine in 50 ml of diethyl ether is subsequently added dropwise with stirring. The mixture is heated under reflux for 1 hour and again cooled to room temperature. 28.3 g (0.185 mole) of 1-chloro-cyclopropyl chloromethyl ketone are added dropwise with stirring and the mixture is then heated under reflux for a further 2 hours. After cooling to room temperature, the reaction mixture is poured into a saturated aqueous ammonium chloride solution and the mixture is extracted three times with diethyl ether. The combined organic phases are washed once with water, dried over sodium sulphate and concentrated under reduced pressure. 47.0 g (97% of theory) of 1-chloro-2-(1-chloro-cyclopropyl)-4-(thiophen-2-yl)-but-3-in-2-ol are obtained in this way in the form of an oil which is reacted further without additional purification. After completion of the addition the reaction mixture is heated under reflux for 30 minutes The mixture is heated under reflux for 1 hour again cooled to room temperature with stirring the mixture is then heated under reflux for a further 2 hours After cooling to room temperature the mixture is extracted three times with diethyl ether The combined organic phases are washed once with water dried over sodium sulphate concentrated under reduced pressure

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

Procedure: ##STR20## A solution of 5 g (25 mmol) of α-bromostyrene in 10 ml of absolute diethyl ether is added dropwise to a mixture of 0.7 g (30 mmol) of magnesium filings and 10 ml of diethyl ether under an argon atmosphere and with stirring at room temperature. After the addition has ended, the reaction mixture is refluxed for 1 hour. The resulting Grignard solution is added dropwise at room temperature with stirring to a solution of 3 g (20 mmol) of 1-chlorocyclopropyl chloromethyl ketone in 10 ml of diethyl ether. After the addition has ended, the mixture is refluxed for another 4 hours. The reaction mixture is subsequently treated with a saturated, aqueous ammonium chloride solution, the resulting mixture is poured into water, and this mixture is extracted repeatedly using diethyl ether. The combined organic phase are washed with saturated, aqueous sodium chloride solution, dried over sodium sulphate, and then concentrated by stripping off the solvent under reduced pressure. 5.0 g (97% of theory) of 1-chloro-2-(1-chlorocyclopropyl)-3-phenyl-but-3-en-2-ol are obtained. After the addition the reaction mixture is refluxed for 1 hour The resulting Grignard solution is added dropwise at room temperature After the addition the mixture is refluxed for another 4 hours this mixture is extracted repeatedly using diethyl ether The combined organic phase are washed with saturated, aqueous sodium chloride solution dried over sodium sulphate concentrated

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

Procedure: 22.2 g (0.203 mole) of ethyl bromide are slowly added to 4.9 g (0.203 mole) of magnesium turnings in 100 ml of diethyl ether. After completion of the addition, the reaction mixture is heated under reflux for 30 minutes and then cooled to room temperature, and a solution of 20 g (0.185 mole) of 2-thienylethine in 50 ml of diethyl ether is subsequently added dropwise with stirring. The mixture is heated under reflux for 1 hour and again cooled to room temperature. 28.3 g (0.185 mole) of 1-chloro-cyclopropyl chloromethyl ketone are added dropwise with stirring and the mixture is then heated under reflux for a further 2 hours. After cooling to room temperature, the reaction mixture is poured into a saturated aqueous ammonium chloride solution and the mixture is extracted three times with diethyl ether. The combined organic phases are washed once with water, dried over sodium sulphate and concentrated under reduced pressure. 47.0 g (97% of theory) of 1-chloro-2-(1-chlorocyclopropyl)-4-(thiophen-2-yl)-but-3-in-2-ol are obtained in this way in the form of an oil which is reacted further without additional purification. After completion of the addition the reaction mixture is heated under reflux for 30 minutes The mixture is heated under reflux for 1 hour again cooled to room temperature with stirring the mixture is then heated under reflux for a further 2 hours After cooling to room temperature the mixture is extracted three times with diethyl ether The combined organic phases are washed once with water dried over sodium sulphate concentrated under reduced pressure