Acetaldehyde → 4-Hydroxy-1-phenylpentane

Temperature

-78 °C

In one portion, 3.6 ml (4.72 g, 23.7 mmol) of 3-phenylpropyl bromide are added to a suspension of 5.2 g (213 mmol) of magnesium in 30 ml of diethyl ether. A further 30 ml (39.3 g, 197 mmol) of 3-phenylpropyl bromide are added dropwise at such a rate that constant reflux is maintained. After the addition has ended, the mixture is diluted with 100 ml of diethyl ether and refluxed for 30 min. The mixture is diluted with a further 80 ml of diethyl ether and cooled to −78° C. A solution, of a temperature of 0° C., of 19 ml of acetaldehyde in 50 ml of ether is added dropwise, and the reaction mixture is stirred at −78° C. for 2 hours and warmed to room temperature. 50 ml of saturated NH4Cl solution are added and the organic phase is extracted with 1N HCl and saturated NaHCO3 solution and dried over Na2SO4. Removal of the solvent gives 33.4 g (95%) of a slightly yellow oil.

1. temperaturethat constant reflux
2. temperatureis maintained
3. additionAfter the addition
4. temperaturerefluxed for 30 min
5. temperaturewarmed to room temperature
6. extractionthe organic phase is extracted with 1N HCl and saturated NaHCO3 solution
7. dry with materialdried over Na2SO4
8. customRemoval of the solvent
9. customgives 33.4 g (95%) of a slightly yellow oil

ORD record

ord-640336f86bdb4f039d27198a0b0c0c44

Source dataset

uspto-grants-2002_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06458796B1