2,2,5,5-四甲基环戊烷-1-one

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 100 ml of a 3M methylmagnesium bromide/ether solution was added to a solution of 30 g of 2,2,5,5-tetramethylcyclopentanone in 50 ml of ether under a nitrogen gas atmosphere, and the mixture was stirred at room temperature overnight. Then, 65 ml of aqueous saturated ammonium chloride solution was added dropwise thereto and the mixture was stirred for 10 minutes. The ether layer was subjected to decantation and the residue was extracted with ether. The ether layers were dried over anhydrous sodium sulfate, and concentrated under reduced pressure, whereby 30 g of 1,2,2,5,5-pentamethylcyclopentanol was obtained. the mixture was stirred for 10 minutes the residue was extracted with ether The ether layers were dried over anhydrous sodium sulfate concentrated under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: After cooling, 100 ml of t-butanol was slowly added dropwise thereto to decompose excess sodium hydride, and then 1.0 l of water was added thereto. The reaction mixture was further heated for 2 hours under reflux to decompose excess dimethyl sulfate. After cooling, the resulting two layers were separated and the organic layer was washed with aqueous saturated sodium chloride solution, and dried over anhydrous sodium sulfate. The solvent was distilled away under reduced pressure, and the residue was distilled under reduced pressure, whereby 59 g of 2,2,5,5-tetramethylcyclopentanone was obtained (b.p. 55° C./20 mmHg). After cooling The reaction mixture was further heated for 2 hours under reflux After cooling the resulting two layers were separated the organic layer was washed with aqueous saturated sodium chloride solution dried over anhydrous sodium sulfate The solvent was distilled away under reduced pressure the residue was distilled under reduced pressure

反应条件: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 54.9 g of 2,2,5,5-tetramethylcyclopentanone was dissolved in a solvent mixture of 95 ml of methanol and 95 ml of water, and 24.0 g of sodium borohydride was added thereto. The mixture was stirred at 70° C. for 15 hours. The reaction solution was concentrated under reduced pressure, and 100 ml of water was added thereto. The mixture was twice extracted with 100 ml of chloroform, and the organic layers were combined and washed with 100 ml of an aqueous saturated sodium chloride solution. Then, the solution was concentrated under reduced pressure. The liquid residue was distilled under reduced pressure, whereby 43.25 g of 2,2,5,5-tetramethylcyclopentanol was obtained as a colorless oily substance (b.p. 40° C./3 mmHg). was added The reaction solution was concentrated under reduced pressure, and 100 ml of water was added The mixture was twice extracted with 100 ml of chloroform washed with 100 ml of an aqueous saturated sodium chloride solution Then, the solution was concentrated under reduced pressure The liquid residue was distilled under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 100 ml of a 3M methylmagnesium bromide/ether solution was added to a solution of 30 g of 2,2,5,5-tetramethylcyclopentanone in 50 ml of ether under a nitrogen gas atmosphere, and the mixture was stirred at room temperature overnight. Then, 65 ml of aqueous saturated ammonium chloride solution was added dropwise thereto and the mixture was stirred for 10 minutes. The ether layer was subjected to decantation and the residue was extracted with ether. The ether layers were dried over anhydrous sodium sulfate, and concentrated under reduced pressure, whereby 30 g of 1,2,2,5,5-pentamethylcyclopentanol was obtained. the mixture was stirred for 10 minutes the residue was extracted with ether The ether layers were dried over anhydrous sodium sulfate concentrated under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: After cooling, 100 ml of t-butanol was slowly added dropwise thereto to decompose excess sodium hydride, and then 1.0 l of water was added thereto. The reaction mixture was further heated for 2 hours under reflux to decompose excess dimethyl sulfate. After cooling, the resulting two layers were separated and the organic layer was washed with aqueous saturated sodium chloride solution, and dried over anhydrous sodium sulfate. The solvent was distilled away under reduced pressure, and the residue was distilled under reduced pressure, whereby 59 g of 2,2,5,5-tetramethylcyclopentanone was obtained (b.p. 55° C./20 mmHg). After cooling The reaction mixture was further heated for 2 hours under reflux After cooling the resulting two layers were separated the organic layer was washed with aqueous saturated sodium chloride solution dried over anhydrous sodium sulfate The solvent was distilled away under reduced pressure the residue was distilled under reduced pressure

反应条件: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 54.9 g of 2,2,5,5-tetramethylcyclopentanone was dissolved in a solvent mixture of 95 ml of methanol and 95 ml of water, and 24.0 g of sodium borohydride was added thereto. The mixture was stirred at 70° C. for 15 hours. The reaction solution was concentrated under reduced pressure, and 100 ml of water was added thereto. The mixture was twice extracted with 100 ml of chloroform, and the organic layers were combined and washed with 100 ml of an aqueous saturated sodium chloride solution. Then, the solution was concentrated under reduced pressure. The liquid residue was distilled under reduced pressure, whereby 43.25 g of 2,2,5,5-tetramethylcyclopentanol was obtained as a colorless oily substance (b.p. 40° C./3 mmHg). was added The reaction solution was concentrated under reduced pressure, and 100 ml of water was added The mixture was twice extracted with 100 ml of chloroform washed with 100 ml of an aqueous saturated sodium chloride solution Then, the solution was concentrated under reduced pressure The liquid residue was distilled under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a magnetically stirred solution of 10 g (0.071 mol) 2,2,5,5-tetramethycyclopentanone in 75 ml of dry tetrahydrofuran at 0° C. under argon is added 2.69 g (0.071 mol) of lithium aluminum hydride. When the reduction was complete, ethyl acetate was introduced dropwise to destroy unreacted lithium aluminum hydride. 25 mls of water is then added, followed by 300 mls of diethyl ether. The organic phase is washed into 100 mls of water, and dried over MgSO4. Filtration followed by evaporation afforded 8.23 g of 2,2,5,5-tetramethylcyclopentanol. to destroy unreacted lithium aluminum hydride 25 mls of water is then added The organic phase is washed into 100 mls of water dried over MgSO4 Filtration followed by evaporation

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a magnetically stirred solution of 10 g (0.071 mol) 2,2,5,5-tetramethycyclopentanone in 75 ml of dry tetrahydrofuran at 0° C. under argon is added 2.69 g (0.071 mol) of lithium aluminum hydride. When the reduction was complete, ethyl acetate was introduced dropwise to destroy unreacted lithium aluminum hydride. 25 mls of water is then added, followed by 300 mls of diethyl ether. The organic phase is washed into 100 mls of water, and dried over MgSO4. Filtration followed by evaporation afforded 8.23 g of 2,2,5,5-tetramethylcyclopentanol. to destroy unreacted lithium aluminum hydride 25 mls of water is then added The organic phase is washed into 100 mls of water dried over MgSO4 Filtration followed by evaporation

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 100 ml of a 3M methylmagnesium bromide/ether solution was added to a solution of 30 g of 2,2,5,5-tetramethylcyclopentanone in 50 ml of ether under a nitrogen gas atmosphere, and the mixture was stirred at room temperature overnight. Then, 65 ml of aqueous saturated ammonium chloride solution was added dropwise thereto and the mixture was stirred for 10 minutes. The ether layer was subjected to decantation and the residue was extracted with ether. The ether layers were dried over anhydrous sodium sulfate, and concentrated under reduced pressure, whereby 30 g of 1,2,2,5,5-pentamethylcyclopentanol was obtained. the mixture was stirred for 10 minutes the residue was extracted with ether The ether layers were dried over anhydrous sodium sulfate concentrated under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: After cooling, 100 ml of t-butanol was slowly added dropwise thereto to decompose excess sodium hydride, and then 1.0 l of water was added thereto. The reaction mixture was further heated for 2 hours under reflux to decompose excess dimethyl sulfate. After cooling, the resulting two layers were separated and the organic layer was washed with aqueous saturated sodium chloride solution, and dried over anhydrous sodium sulfate. The solvent was distilled away under reduced pressure, and the residue was distilled under reduced pressure, whereby 59 g of 2,2,5,5-tetramethylcyclopentanone was obtained (b.p. 55° C./20 mmHg). After cooling The reaction mixture was further heated for 2 hours under reflux After cooling the resulting two layers were separated the organic layer was washed with aqueous saturated sodium chloride solution dried over anhydrous sodium sulfate The solvent was distilled away under reduced pressure the residue was distilled under reduced pressure

反应条件: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 54.9 g of 2,2,5,5-tetramethylcyclopentanone was dissolved in a solvent mixture of 95 ml of methanol and 95 ml of water, and 24.0 g of sodium borohydride was added thereto. The mixture was stirred at 70° C. for 15 hours. The reaction solution was concentrated under reduced pressure, and 100 ml of water was added thereto. The mixture was twice extracted with 100 ml of chloroform, and the organic layers were combined and washed with 100 ml of an aqueous saturated sodium chloride solution. Then, the solution was concentrated under reduced pressure. The liquid residue was distilled under reduced pressure, whereby 43.25 g of 2,2,5,5-tetramethylcyclopentanol was obtained as a colorless oily substance (b.p. 40° C./3 mmHg). was added The reaction solution was concentrated under reduced pressure, and 100 ml of water was added The mixture was twice extracted with 100 ml of chloroform washed with 100 ml of an aqueous saturated sodium chloride solution Then, the solution was concentrated under reduced pressure The liquid residue was distilled under reduced pressure