Reacción #2146734

Ecuación de reacción

(5Z)-3-methylnon-5-enyl acetate

sodium hydroxide

→

(5Z)-3-methylnon-5-en-1-ol

Rendimiento 92.0%

Disolventes

ethanol

water

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturathe reaction mixture was subsequently heated
2. 2
   Temperaturato reflux for 3 h
3. 3
   TemperaturaAfter the reaction mixture had cooled to room temp.
4. 4
   Otrothe ethanol was removed in a rotary evaporator under reduced pressure
5. 5
   workup.ADDITIONthe resulting residue diluted with 300 mL of water
6. 6
   ExtracciónThe crude product was extracted twice with 500 mL of ether each, and the combined organic extracts
7. 7
   Lavadowere washed twice with 300 mL of brine
8. 8
   SecadoAfter drying with sodium sulphate and removal of the solvent under reduced pressure
9. 9
   Otrothe resulting residue (51.2 g) was purified by flash chromatography (1.00 kg of silica gel, pentane/ether, 9:1, Rf=0.11)

Procedimiento

In the next step, 55.0 g (278 mmol) of this (5Z)-3-methylnon-5-enyl acetate was dissolved in 600 mL of a 1:1 mixture of ethanol and water. With vigorous stirring, 55.5 g (1.39 mol) of sodium hydroxide was added, and the reaction mixture was subsequently heated to reflux for 3 h. After the reaction mixture had cooled to room temp., the ethanol was removed in a rotary evaporator under reduced pressure, and the resulting residue diluted with 300 mL of water. The crude product was extracted twice with 500 mL of ether each, and the combined organic extracts were washed twice with 300 mL of brine. After drying with sodium sulphate and removal of the solvent under reduced pressure, the resulting residue (51.2 g) was purified by flash chromatography (1.00 kg of silica gel, pentane/ether, 9:1, Rf=0.11) to provide 39.9 g (92%) of (5Z)-3-methylnon-5-en-1-ol as a colourless liquid.

Fuente