a Farnesol → (2E,6E)-3,7,11-trimethyldodeca-2,6,10-trienal

Temperatur

-65 °C

A solution of oxalyl chloride (4.68 g, 0.037 mol) in dry CH2Cl2 under argon atmosphere was cooled to-65° C. A solution of dimethyl sulfoxide (DMSO) (5.33 ml) in CH2Cl2 (17 ml) was added rapidly, dropwise, to the cooled oxalyl chloride solution. After stirring for 7 minutes at -65° C., a 10 ml CH2Cl2 solution of (E,E)-farnesol (7.0 g, 0.032 mol) was added over 10 minutes to the reaction solution at -65° C.: a precipitate formed upon the addition of approximately half of the farnesol solution. After the addition of the farnesol solution was completed, the reaction was stirred at -65° C. for 25 minutes, and then 22.4 ml (0.16 mol) of triethylamine was added over 10 minutes. After stirring for an additional 15 minutes at -65° C., the reaction was warmed to room temperature, and then diluted with water (~200 ml). The resulting aqueous layer was extracted several times with CH2Cl2. The combined organic layers were washed once with saturated aqueous NaCl solution once with 1% HCl, once with 5% Na2CO3 solution and once with saturated aqueous NaCl solution. The resulting organic layer was dried over MgSO4 to give 7.05 g (100%) of a clear oil after filtration and solvent removal.

1. stirringAfter stirring for an additional 15 minutes at -65° C.
2. temperaturethe reaction was warmed to room temperature
3. extractionThe resulting aqueous layer was extracted several times with CH2Cl2
4. washThe combined organic layers were washed once with saturated aqueous NaCl solution once with 1% HCl, once with 5% Na2CO3 solution and once with saturated aqueous NaCl solution
5. dry with materialThe resulting organic layer was dried over MgSO4

ORD-Eintrag

ord-2225560d2a98479d87e84f3165224056

Quelldatensatz

uspto-grants-1993_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05212164