Iodide Ion → 5-Nonanone

n-Butyl magnesium bromide (2 M solution in diethyl ether; 1 ml; 2 mM) was added to a suspension of copper I iodide (0.038 gm; 0.2 mM) in dry tetrahydrofuran (50 ml) at -78° C. under an aron atmosphere. The suspension was stirred at this temperature for a further fifteen minutes and then the protected α,β-unsaturated aldehyde was added as a solution in dry tetrahydrofuran (10 ml). The reaction mixture was stirred at -78° C. for fifteen minutes, 0° C. for one hour and room temperature for three days, under an argon atmosphere. The reaction was quenched by the addition of excess saturated ammonium chloride solution. The resulting solution was extracted with ethyl acetate and the organic layer washed with water, saturated sodium chloride solution and dried over anhydrous magnesium sulphate. Removal of the solvent at reduced pressure yielded a pale yellow oil, which was dissolved in dry dichloromethane (20 ml). Powdered sodium acetate (0.110 gm) was added to the solution; followed by pyridinium chlorochromate (0.263 gm; 1.22 mM). The suspension was stirred at room temperature for one hour and then triturated with dry diethyl ether (50 ml). The resulting black suspension was filtered through a pad of florasil, washing several times with ether. The filtrate was evaporated to dryness at reduced pressure and the residual oil partitioned between ethyl acetate and water. The organic layer was washed with sodium bicarbonate solution, sodium chloride solution, dried over magnesium sulphate and the solvent removed at reduced pressure to afford a pale yellow oil, which was redissolved in 1,4-dioxan/water (4:1; 5 ml). 1 N Hydrochloric acid (two drops) was added and the solution shaken at room temperature for three minutes. Excess sodium bicarbonate solution was added, the aqueous solution saturated with sodium chloride and the product extracted with ethyl acetate. The organic layer was washed with sodium chloride solution, dried over magnesium sulphate and the solvent evaporated at reduced pressure to yield the crude α,β-unsaturated n-butyl ketone as a yellow oil (0.110 gm). The product was purified by silica gel column chromatography (Type 60; 3 gm). Elution with 2% methanol/chloroform afforded the pure ketone as a colourless oil (0.027 gm, 12%), λ max (EtOH) 239 nm (εm 9.800); ν max (CHBr3) 3400, 1680, 1615 cm-1 ; δ H (CDCl3) 6.12 (1H, s, CH=CC), 2.42 (t, COCH2), 2.15 (3H, s, CH3 -15), 1.5-1.1 (10H, m, +d, CH3 -14+methylene protons), 0.93 (6 H, broad d, CH3 -17+butyl-CH3); δC (CDCl3), 201.7, 155.0, 125.2, 75.1, 71.3, 70.4, 69.0, 65.5, 61.3, 55.6, 44.2, 43.2, 42.8, 39.6, 31.7, 26.4, 22.4, 20.8, 19.6, 13.9, 12.7; m/e 384.2487 (2%, M+, C21H36O6 requires 384.2464), 366 (2%), 348 (3%), 244 (30%), 227 (55%), 209 (20%), 152 (65%), 85 (100%).

1. stirringThe reaction mixture was stirred at -78° C. for fifteen minutes, 0° C. for one hour and room temperature for three days, under an argon atmosphere
2. customThe reaction was quenched by the addition of excess saturated ammonium chloride solution
3. extractionThe resulting solution was extracted with ethyl acetate
4. washthe organic layer washed with water, saturated sodium chloride solution
5. dry with materialdried over anhydrous magnesium sulphate
6. customRemoval of the solvent at reduced pressure
7. customyielded a pale yellow oil, which
8. stirringThe suspension was stirred at room temperature for one hour
9. customtriturated with dry diethyl ether (50 ml)
10. filtrationThe resulting black suspension was filtered through a pad of florasil
11. washwashing several times with ether
12. customThe filtrate was evaporated to dryness at reduced pressure
13. customthe residual oil partitioned between ethyl acetate and water
14. washThe organic layer was washed with sodium bicarbonate solution, sodium chloride solution
15. dry with materialdried over magnesium sulphate
16. customthe solvent removed at reduced pressure
17. customto afford a pale yellow oil, which
18. stirringthe solution shaken at room temperature for three minutes
19. extractionthe aqueous solution saturated with sodium chloride and the product extracted with ethyl acetate
20. washThe organic layer was washed with sodium chloride solution
21. dry with materialdried over magnesium sulphate
22. customthe solvent evaporated at reduced pressure

ORD record

ord-228f5d4fec364d629cfd7c5117d9cb2b

Source dataset

uspto-grants-1982_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04312874