1,3-diphenylprop-2-yn-1-one

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

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

Procedure: Potassium hydroxide (3.48 mmol), dissolved in water (0.87 M (4.0 ml)), is added over about 30 minutes to a refluxing solution of the alpha-bromochalcone (3.48 mmol) in 0.35 M of 1:1 water/acetone (5 ml each). After 20 minutes of further refluxing, the solution is cooled and diluted with water. The water is extracted with ether, which is dried with MgSO4 and evaporated. Chromatography on silica gel yielded 1,3-diphenylpropynone and its derivatives. the solution is cooled The water is extracted with ether, which is dried with MgSO4 evaporated

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

Procedure: Potassium hydroxide (3.48 mmol), dissolved in water (0.87 M (4.0 ml)), is added over about 30 minutes to a refluxing solution of the alpha-bromochalcone (3.48 mmol) in 0.35 M of 1:1 water/acetone (5 ml each). After 20 minutes of further refluxing, the solution is cooled and diluted with water. The water is extracted with ether, which is dried with MgSO4 and evaporated. Chromatography on silica gel yielded 1,3-diphenylpropynone and its derivatives. the solution is cooled The water is extracted with ether, which is dried with MgSO4 evaporated

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

Procedure: Potassium hydroxide (3.48 mmol), dissolved in water (0.87 M (4.0 ml)), is added over about 30 minutes to a refluxing solution of the alpha-bromochalcone (3.48 mmol) in 0.35 M of 1:1 water/acetone (5 ml each). After 20 minutes of further refluxing, the solution is cooled and diluted with water. The water is extracted with ether, which is dried with MgSO4 and evaporated. Chromatography on silica gel yielded 1,3-diphenylpropynone and its derivatives. VI. alpha-Tetralonylideneacetophenone Derivatives the solution is cooled The water is extracted with ether, which is dried with MgSO4 evaporated

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

Procedure: Potassium hydroxide (3.48 mmol), dissolved in water (0.87 M (4.0 ml)), is added over about 30 minutes to a refluxing solution of the alpha-bromochalcone (3.48 mmol) in 0.35 M of 1:1 water/acetone (5 ml each). After 20 minutes of further refluxing, the solution is cooled and diluted with water. The water is extracted with ether, which is dried with MgSO4 and evaporated. Chromatography on silica gel yielded 1,3-diphenylpropynone and its derivatives. the solution is cooled The water is extracted with ether, which is dried with MgSO4 evaporated

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

Procedure: Potassium hydroxide (3.48 mmol), dissolved in water (0.87 M (4.0 ml)), is added over about 30 minutes to a refluxing solution of the alpha-bromochalcone (3.48 mmol) in 0.35 M of 1:1 water/acetone (5 ml each). After 20 minutes of further refluxing, the solution is cooled and diluted with water. The water is extracted with ether, which is dried with MgSO4 and evaporated. Chromatography on silica gel yielded 1,3-diphenylpropynone and its derivatives. the solution is cooled The water is extracted with ether, which is dried with MgSO4 evaporated

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

Procedure: Potassium hydroxide (3.48 mmol), dissolved in water (0.87 M (4.0 ml)), is added over about 30 minutes to a refluxing solution of the alpha-bromochalcone (3.48 mmol) in 0.35 M of 1:1 water/acetone (5 ml each). After 20 minutes of further refluxing, the solution is cooled and diluted with water. The water is extracted with ether, which is dried with MgSO4 and evaporated. Chromatography on silica gel yielded 1,3-diphenylpropynone and its derivatives. the solution is cooled The water is extracted with ether, which is dried with MgSO4 evaporated

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

Procedure: Place lithium diisopropylamide (10 mL of a 1.5M solution in cyclohexane) and tetrahydrofuran (40 mL) under an argon atmosphere and cool to 0° C. Add, by dropwise addition, phenylacetylene (1.65 mL, 15 mmol). Remove the cooling bath and stir for 30 minutes as room temperature. Cool the yellow solution to 0° C. and add, by dropwise addition, N-methoxy-N-methylbenzamide (3.04 mL, 20 mmol). Remove the cooling bath and stir for 30 minutes at room temperature. Pour onto ethyl ether and water, separate the organic phase and dry (MgSO4). Filter and evaporate the solvent in vacuo to yield an oil. Purify by silica gel chromatography (2% ethyl acetate/hexane) then purify further by distillation (2×) to yield 1.9 g of the title compound; bp 210° C. in vacuo. Remove the cooling bath Cool the yellow solution to 0° C. Remove the cooling bath stir for 30 minutes at room temperature Pour onto ethyl ether and water separate the organic phase dry (MgSO4) Filter evaporate the solvent in vacuo to yield an oil Purify by silica gel chromatography (2% ethyl acetate/hexane) then purify further by distillation (2×)

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

Procedure: Place lithium diisopropylamide (10 mL of a 1.5M solution in cyclohexane) and tetrahydrofuran (40 mL) under an argon atmosphere and cool to 0° C. Add, by dropwise addition, phenylacetylene (1.65 mL, 15 mmol). Remove the cooling bath and stir for 30 minutes as room temperature. Cool the yellow solution to 0° C. and add, by dropwise addition, N-methoxy-N-methylbenzamide (3.04 mL, 20 mmol). Remove the cooling bath and stir for 30 minutes at room temperature. Pour onto ethyl ether and water, separate the organic phase and dry (MgSO4). Filter and evaporate the solvent in vacuo to yield an oil. Purify by silica gel chromatography (2% ethyl acetate/hexane) then purify further by distillation (2×) to yield 1.9 g of the title compound; bp 210° C. in vacuo. Remove the cooling bath Cool the yellow solution to 0° C. Remove the cooling bath stir for 30 minutes at room temperature Pour onto ethyl ether and water separate the organic phase dry (MgSO4) Filter evaporate the solvent in vacuo to yield an oil Purify by silica gel chromatography (2% ethyl acetate/hexane) then purify further by distillation (2×)

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

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

Procedure: Potassium hydroxide (3.48 mmol), dissolved in water (0.87 M (4.0 ml)), is added over about 30 minutes to a refluxing solution of the alpha-bromochalcone (3.48 mmol) in 0.35 M of 1:1 water/acetone (5 ml each). After 20 minutes of further refluxing, the solution is cooled and diluted with water. The water is extracted with ether, which is dried with MgSO4 and evaporated. Chromatography on silica gel yielded 1,3-diphenylpropynone and its derivatives. the solution is cooled The water is extracted with ether, which is dried with MgSO4 evaporated

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

Procedure: In step b, the appropriate α-[(phenyl)ethynyl]-benzenemethanol compound of structure 6 can be oxidized to the corresponding 1-phenyl-3-phenyl-2-propyne-1-one compound of structure 5 by techniques and procedures well known and appreciated by one of ordinary skill in the art. For example, the appropriate α-[(phenyl)ethynyl]-benzenemethanol compound of structure 6 can be oxidized to the corresponding 1-phenyl-3-phenyl-2-propyne-1-one compound of structure 5 by means of either a Swern oxidation (dimethylsulfoxide, oxalyl chloride, and triethylamine), by means of pyridinium dichromate oxidation in a suitable aprotic solvent, such as methylene chloride or by means of barium manganate oxidation in a suitable aprotic solvent, such asmethylene chloride.