2-壬酮

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

实验步骤: h. 2,5-Dimethyl-3,6-dihexyl-pyrazine was prepared by first forming 3-oximino-2-nonanone by reacting 2-nonanone with nitrosyl chloride according to the method of BOUVEAULT (loc.cit.). The autocondensation of two moles of the imino-ketone in the presence of zinc and acetic acid [according to the method described in Chimia 11, 310 (1957)] yielded 2,5-dimethyl-3,6-dihexyl-pyrazine which had a b.p. of 112°-120°C./0.01 mm. Hg.

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

实验步骤: h. 2,5-Dimethyl-3,6-dihexyl-pyrazine was prepared by first forming 3-oximino-2-nonanone by reacting 2-nonanone with nitrosyl chloride according to the method of BOUVEAULT (loc.cit.). The autocondensation of two moles of the imino-ketone in the presence of zinc and acetic acid [according to the method described in Chimia 11, 310 (1957)] yielded 2,5-dimethyl-3,6-dihexyl-pyrazine which had a b.p. of 112°-120°C./0.01 mm. Hg.

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

实验步骤: Prepared from glyoxylic acid (5.35 g, 7.0 mmol), 2-nonanone (14.2 g, 1.0 mol) and orthophosphoric acid (20 ml). νmax 2925, 2850, 1700, 1450, 1410, 1350, 1220, 1120, 870, 770, 720 cm−1. 1H n.m.r. δ (CDCl3) 0.87, t J 7.2 Hz, 3H, CH3; 1.29, m, 8H, CH2; 2.39, s, 3H, CH3; 2.77, t J 6.8 Hz, 2H, CH2; 6.50, s, CH.

反应条件: temp:-20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: BK1114. Trimethylsulfonium iodide (23.53 g, 115.3 mmol) was suspended in anhydrous THF (250 mL) under argon and the slurry cooled to −20° C. A pre-cooled (−20° C.) solution of n-BuLi (2.14M in hexanes, 51.2 mL, 109 mmol) was added slowly via cannulating needle and the solution stirred for 10 minutes at −20° C. A pre-cooled (−20° C.) solution 2-nonanone (5.0 mL, 28.8 mmol) was then added slowly via cannulating needle and the resultant solution was stirred at −20° C. for 1 hour. The reaction was allowed to warm to room temperature over 2 hours. Water (200 mL) was added and the mixture was extracted with Et2O (3×100 mL). The combined organics were dried over MgSO4, filtered and concentrated in vacuo to afford an oily residue. This material was chromatographed on silica gel (eluting with 10% EtOAc/hexanes) to afford 3-hydroxy-3-methyl-1-decene (3.56 g, 72% yield) as a colorless oil. was added slowly was then added slowly to warm to room temperature over 2 hours the mixture was extracted with Et2O (3×100 mL) The combined organics were dried over MgSO4 filtered concentrated in vacuo to afford an oily residue This material was chromatographed on silica gel (eluting with 10% EtOAc/hexanes)

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

实验步骤: h. 2,5-Dimethyl-3,6-dihexyl-pyrazine was prepared by first forming 3-oximino-2-nonanone by reacting 2-nonanone with nitrosyl chloride according to the method of BOUVEAULT (loc.cit.). The autocondensation of two moles of the imino-ketone in the presence of zinc and acetic acid [according to the method described in Chimia 11, 310 (1957)] yielded 2,5-dimethyl-3,6-dihexyl-pyrazine which had a b.p. of 112°-120°C./0.01 mm. Hg.

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

实验步骤: h. 2,5-Dimethyl-3,6-dihexyl-pyrazine was prepared by first forming 3-oximino-2-nonanone by reacting 2-nonanone with nitrosyl chloride according to the method of BOUVEAULT (loc.cit.). The autocondensation of two moles of the imino-ketone in the presence of zinc and acetic acid [according to the method described in Chimia 11, 310 (1957)] yielded 2,5-dimethyl-3,6-dihexyl-pyrazine which had a b.p. of 112°-120°C./0.01 mm. Hg.

反应条件: temp:-20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: BK1114. Trimethylsulfonium iodide (23.53 g, 115.3 mmol) was suspended in anhydrous THF (250 mL) under argon and the slurry cooled to −20° C. A pre-cooled (−20° C.) solution of n-BuLi (2.14M in hexanes, 51.2 mL, 109 mmol) was added slowly via cannulating needle and the solution stirred for 10 minutes at −20° C. A pre-cooled (−20° C.) solution 2-nonanone (5.0 mL, 28.8 mmol) was then added slowly via cannulating needle and the resultant solution was stirred at −20° C. for 1 hour. The reaction was allowed to warm to room temperature over 2 hours. Water (200 mL) was added and the mixture was extracted with Et2O (3×100 mL). The combined organics were dried over MgSO4, filtered and concentrated in vacuo to afford an oily residue. This material was chromatographed on silica gel (eluting with 10% EtOAc/hexanes) to afford 3-hydroxy-3-methyl-1-decene (3.56 g, 72% yield) as a colorless oil. was added slowly was then added slowly to warm to room temperature over 2 hours the mixture was extracted with Et2O (3×100 mL) The combined organics were dried over MgSO4 filtered concentrated in vacuo to afford an oily residue This material was chromatographed on silica gel (eluting with 10% EtOAc/hexanes)

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

实验步骤: 10 g (6.5 mmol) of vanillin and 9.3 g (6.5 mmol) of 2-nonanone were dissolved by stirring in 30 ml of hexane and 20 ml of diethyl ether. Moreover, after adding 3.9 g of acetic acid, 4.6 ml (6.5 mmol) of piperidine was added followed by stirring for 6 hours. Following completion of the reaction, unreacted vanillin was removed with an aqueous sodium bicarbonate solution followed by extraction with diethyl ether. After drying with anhydrous magnesium sulfate, the solvent was distilled off to obtain 20.2 g of crude product. The crude product was purified by column chromatography (SiO2/CHCl3) to obtain (E)-1-(4′-hydroxy-3′-methoxyphenyl)dec-1-en-3-one (17.94 g, yield: 90%). was added was removed with an aqueous sodium bicarbonate solution followed by extraction with diethyl ether After drying with anhydrous magnesium sulfate the solvent was distilled off to obtain 20.2 g of crude product The crude product was purified by column chromatography (SiO2/CHCl3)

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

实验步骤: h. 2,5-Dimethyl-3,6-dihexyl-pyrazine was prepared by first forming 3-oximino-2-nonanone by reacting 2-nonanone with nitrosyl chloride according to the method of BOUVEAULT (loc.cit.). The autocondensation of two moles of the imino-ketone in the presence of zinc and acetic acid [according to the method described in Chimia 11, 310 (1957)] yielded 2,5-dimethyl-3,6-dihexyl-pyrazine which had a b.p. of 112°-120° C./0.01 mm. Hg.

反应条件: temp:35.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 100 g potassium hydroxide were dissolved in 500 g of methanol and heated up to reflux under stirring. A solution of 142 g of nonanone and 152 g of vanillin in 120 g of methanol were subsequently added continuously over a period of 1 hour. After that, the mixture was stirred for further 24 hours at the same temperature. After distilling 400 g of methanol from the mixture in vacuo, 400 g of toluene were added to the remaining residue, and after cooling to approximately 30-40° C. additionally 800 g of water were added. The mixture was then acidified with approximately 380 g of diluted sulphuric acid (20% in water) to a pH value of 4-5. After phase separation, the organic phase was washed with 200 g of water. After distillation, 120 g of the intermediate product 1-(4-hydroxy-3-methoxy-phenyl)-dec-1-en-3-one were obtained. Melting point: 45° C., yield: 42% of theory. heated up to reflux After that, the mixture was stirred for further 24 hours at the same temperature After distilling 400 g of methanol from the mixture in vacuo, 400 g of toluene were added to the remaining residue were added After phase separation the organic phase was washed with 200 g of water After distillation

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

实验步骤: h. 2,5-Dimethyl-3,6-dihexyl-pyrazine was prepared by first forming 3-oximino-2-nonanone by reacting 2-nonanone with nitrosyl chloride according to the method of BOUVEAULT (loc. cit.). The autocondensation of two moles of the imino-ketone in the presence of zinc and acetic acid [according to the method described in Chimia 11, 310 (1957)] yielded 2,5-dimethyl-3,6-dihexyl-pyrazine which had a b.p. of 112°-120° C./0.01 mm. Hg.

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

实验步骤: h. 2,5-Dimethyl-3,6-dihexyl-pyrazine was prepared by first forming 3-oximino-2-nonanone by reacting 2-nonanone with nitrosyl chloride according to the method of BOUVEAULT (loc.cit.). The autocondensation of two moles of the imino-ketone in the presence of zinc and acetic acid [according to the method described in Chimia 11, 310 (1957)] yielded 2,5-dimethyl-3,6-dihexyl-pyrazine which had a b.p. of 112°-120° C./0.01 mm. Hg.