2-benzylidenecyclopentan-1-one

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

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

Procedure: A solution of 30.2 g (0.126 moles) of 3,5-dimethoxy-4-ethoxybenzoic acid hydrazide in 250 cm3 of anhydrous ethanol is added to a solution of 21.8 g (0.126 moles) of 2-phenylmethylenecyclopentan-1-one in 50 cm3 of ethanol. The reaction mixture is boiled for one hour, then cooled. The separated crystals are filtered off and dried. Yield: 39.78 g (80.0%). M.p.: 239°-240° C. cooled The separated crystals are filtered off dried

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

Procedure: A solution of 30.2 g (0.126 moles) of 3,5-dimethoxy-4-ethoxybenzoic acid hydrazide in 250 cm3 of anhydrous ethanol is added to a solution of 21.8 g (0.126 moles) of 2-phenylmethylenecyclopentan-1-one in 50 cm3 of ethanol. The reaction mixture is boiled for one hour, then cooled. The separated crystals are filtered off and dried. Yield: 39.78 g (80.0%). M.p.: 239°-240° C. cooled The separated crystals are filtered off dried

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

Procedure: A solution of 30.2 g (0.126 moles) of 3,5-dimethoxy-4-ethoxybenzoic acid hydrazide in 250 cm3 of anhydrous ethanol is added to a solution of 21.8 g (0.126 moles) of 2-phenylmethylenecyclopentan-1-one in 50 cm3 of ethanol. The reaction mixture is boiled for one hour, then cooled. The separated crystals are filtered off and dried. Yield: 39.78 g (80.0%). M.p.: 239°-240° C. cooled The separated crystals are filtered off dried

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

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

Procedure: 5.2 g (0.03 mol) of 2-benzylidene-cyclopentanone was dissolved in 30 mL anhydrous acetonitrile, treated with 8.4 g (0.09 mol) of N,N-dimethyl-methylene ammonium chloride under refluxing, refluxed for 12 h to yield a solid product, then suction filtered and dried, and recrystallized in acetonitrile/chloroform to give 2-benzylidene-5-dimethylaminomethyl cyclopentanone hydrochloride with a yield of 76.2%. under refluxing refluxed for 12 h to yield a solid product suction filtered dried recrystallized in acetonitrile/chloroform

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

Procedure: With reflux device installed, 36.8 g (0.24 mol) of N-cyclopentenyl morpholine, 27.2 g (0.20 mol) of benzaldehyde and 200 mL of benzene were added to a round bottom flask and heated under reflux for 20 h. The resulting solution was cooled to 30° C., and slowing stirring while 62 mL of hydrochloric acid (6 mol/L) was added to the solution. After stirring for 2 h at room temperature, the benzene layer was separated and washed with water to neutral, and dried over anhydrous sodium sulfate overnight. Then the mixture was filtered and benzene was recovered by evaporation under reduced pressure. The residue was cooled and solidified, then recrystallized in cyclohexane/ethanol to yield 2-benzylidene-cyclopentanone with a yield of 84.6%. With reflux device heated under reflux for 20 h was added to the solution the benzene layer was separated washed with water to neutral, and dried over anhydrous sodium sulfate overnight Then the mixture was filtered benzene was recovered by evaporation under reduced pressure The residue was cooled recrystallized in cyclohexane/ethanol

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

Procedure: A solution of 30.2 g (0.126 moles) of 3,5-dimethoxy-4-ethoxybenzoic acid hydrazide in 250 cm3 of anhydrous ethanol is added to a solution of 21.8 g (0.126 moles) of 2-phenylmethylenecyclopentan-1-one in 50 cm3 of ethanol. The reaction mixture is boiled for one hour, then cooled. The separated crystals are filtered off and dried. Yield: 39.78 g (80.0%). M.p.: 239°-240° C. cooled The separated crystals are filtered off dried

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