1-chloro-1-fluoroethene

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:0.00; pressure:0.00; stir:

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

Procedure: To a suspension of tetrakis(triphenylacetate)dirhodium (3.66 g) and powdered molecule sieves (45 g) in dichloromethane (2.0 L) was added 1-chloro-1-fluoroethene (82 g, 1.02 mol) at −60° C. The reaction mixture was warmed to −35˜−40° C., ethyl 2-diazoacetate (90 g, 790 mmol) in DCM (200 mL) was added and the reaction mixture was stirred at room temperature overnight. The reaction mixture was filtered and evaporated in vacuo to yield 100 g Ethyl 2-chloro-2-fluorocyclopropanecarboxylate as yellow oil which was used directly in the next step without purification. The reaction mixture was warmed to −35˜−40° C. The reaction mixture was filtered evaporated in vacuo

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

Procedure: To a suspension of tetrakis(triphenylacetate)dirhodium (3.66 g) and powdered molecule sieves (45 g) in dichloromethane (2.0 L) was added 1-chloro-1-fluoroethene (82 g, 1.02 mol) at −60° C. The reaction mixture was warmed to −35˜−40° C., ethyl 2-diazoacetate (90 g, 790 mmol) in DCM (200 mL) was added and the reaction mixture was stirred at room temperature overnight. The reaction mixture was filtered and evaporated in vacuo to yield 100 g Ethyl 2-chloro-2-fluorocyclopropanecarboxylate as yellow oil which was used directly in the next step without purification. The reaction mixture was warmed to −35˜−40° C. The reaction mixture was filtered evaporated in vacuo

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

Procedure: 16.9 mg of tetrakis(triphenylacetato) dirhodium was added to 10 ml of dichloromethane and dissolved therein. Then 370 mg of powdery Molecular Sieves 4A was added thereto. The reaction container was soaked in a dry ice/acetone bath and 1.0 g of 1-chloro-1-fluoroethylene was dissolved in the mixture. While maintaining the temperature of this solution at -35° C. to -40° C., 5.3 ml of a solution of 2.5 mmol of ethyl diazoacetate in dichloromethane was dropped thereinto under an argon gas atmosphere. The addition was made in such a manner that a half of the solution was dropped within 15 minutes and another half was dropped within 30 minutes. After the completion of the addition, the reaction mixture was slowly returned to room temperature. When analyzed by gas chromatography, it was found out that the reaction conversion ratio was 100%, the yield was 91% and the ratio of cis:trans was 1.59:1.0. The analytical data of the title product are as follows. dissolved The reaction container was soaked in a dry ice/acetone bath While maintaining the temperature of this solution at -35° C. to -40° C. The addition was dropped within 15 minutes another half was dropped within 30 minutes After the completion of the addition was slowly returned to room temperature

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

Procedure: To a suspension of tetrakis(triphenylacetate)dirhodium (3.66 g) and powdered molecule sieves (45 g) in dichloromethane (2.0 L) was added 1-chloro-1-fluoroethene (82 g, 1.02 mol) at −60° C. The reaction mixture was warmed to −35˜−40° C., ethyl 2-diazoacetate (90 g, 790 mmol) in DCM (200 mL) was added and the reaction mixture was stirred at room temperature overnight. The reaction mixture was filtered and evaporated in vacuo to yield 100 g Ethyl 2-chloro-2-fluorocyclopropanecarboxylate as yellow oil which was used directly in the next step without purification. The reaction mixture was warmed to −35˜−40° C. The reaction mixture was filtered evaporated in vacuo

Conditions: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Cyclohexane (76.6 g), 2,2′-methylenebis[(4S)-4-tert-butyl-2-oxazoline] (293 mg, 1.1 mmol), and copper (II) trifluoromethanesulfonate (361 mg, 1.0 mmol) were added in an autoclave, and then 1-chloro-1-fluoroethylene (80 g, 1.0 mol) was charged under elevated pressure. After the mixture was warmed to 30° C., a mixed solution containing 95% of ethyl diazoacetate (12.01 g, 100 mmol) and cyclohexane (50 g) was charged under elevated pressure over five hours. Cyclohexane (20 ml) was further charged under elevated pressure and stirring was continued at the same temperature for 1 hour, and then the internal pressure was released to obtain a solution of ethyl 2-chloro-2-fluorocyclopropane-carboxylate in cyclohexane (183.86 g). The content of the ethyl 2-chloro-2-fluorocyclopropanecarboxylate was 4.92% (yield based on ethyl diazoacetate: 54.3%), and the ratio of cis-isomer/trans-isomer was 59.5/40.5. The optical purity of the cis-isomer was 71% e.e. (1S,2R), and the optical purity of the trans-isomer was 19% e.e. (1S,2S). was charged under elevated pressure over five hours