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

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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 (2 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.

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