6-甲基辛-5-烯-2-one

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

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: Six grams of 6-methyl-5-octen-2-one is added to a solution of 3.0 g. of sodium borohydride, 80 ml. of methanol and 6 ml. of 2N sodium hydroxide solution. After about two hours, acetic acid is added to destroy excess sodium borohydride and the solution poured into water and extracted with ether. The combined ether extracts are washed with aqueous sodium bicarbonate, water and brine, dried and evaporated to yield 6-methyl-5-octen-2-ol which is purified by chromatography. to destroy excess sodium borohydride the solution poured into water extracted with ether The combined ether extracts are washed with aqueous sodium bicarbonate, water and brine dried evaporated

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

实验步骤: To a solution of 20.9 g. of the ethylene ketal of 1-bromo-4-pentanone (obtained by treating 1-bromo-4-pentanone with ethylene glycol in benzene in the presence of p-toluenesulfonic acid) in 100 ml. of benzene is added 20 g. of triphenylphosphine. The mixture is heated at reflux temperature for two hours and then filtered. The solid material thus-collected is washed with benzene, dried in vacuo and added to 6.49 g. of butyl lithium in 50 ml. of dimethylsulfoxide. The mixture is stirred until an orange solution is obtained and 38 g. of methyl ethyl ketone is then added. The mixture is stirred at about 25° for about eight hours, poured into water and then extracted with ether. The ethereal phase is concentrated and the concentrate added to 0.1N solution of hydrochloric acid in aqueous acetone and stirred for about 15 hours. The mixture is then poured into ice water and extracted with ethyl acetate. The extracts are combined, washed with water, dried over sodium sulfate and evaporated to yield 6-methyl-5-octen-2-one which is purified by chromatography and separated into the cis and trans isomer. The mixture is heated at reflux temperature for two hours filtered The solid material thus-collected is washed with benzene dried in vacuo added to 6.49 g is obtained The mixture is stirred at about 25° for about eight hours extracted with ether The ethereal phase is concentrated the concentrate added to 0.1N solution of hydrochloric acid in aqueous acetone stirred for about 15 hours The mixture is then poured into ice water extracted with ethyl acetate washed with water dried over sodium sulfate evaporated

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

实验步骤: To 2 kg 6-methyl-oct-5-en-2-one in 4 l methanol was added 800 ml concentrated sulphuric acid at 3° C. over a period of 40 minutes. After further stirring for 5 h at room temperature, the solution was poured onto 8 kg of ice water and extracted with tert.-butyl methyl ether. The combined organic phases were washed with 20% Na2CO3 (200 ml) and concentrated NaCl solution (3×150 ml). After removal of the solvent, the residue was distilled over a 70 cm Sulzer column to give 840 g recovered starting material (boiling point: 72°-75° C./10 mm Hg) and 970 g 6-methoxy-6-methyl-2-octanone (bp.: 95°-98° C./10 Torr=13.3 mbar). extracted with tert.-butyl methyl ether The combined organic phases were washed with 20% Na2CO3 (200 ml) and concentrated NaCl solution (3×150 ml) After removal of the solvent the residue was distilled over a 70 cm Sulzer column to give 840 g recovered