Potassium Hydroxide → 4-(2,6,10-Trimethylundeca-1,5,9-trien-1-yl)benzoic acid

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Reaction Steps

20 g of potassium hydroxide was dissolved in 200 ml of isopropanol. 50 g of ethyl p-(2,6,10-trimethyl-1,5,9-undecatrienyl)benzoate was added to the solution under heating, reflux and stirring. After 10 min, the solution was poured into ice/water and extracted with 200 ml of n-hexane. The aqueous layer was made acidic with dilute hydrochloric acid, extracted with ethyl ether, washed with water and dried over magnesium sulfate. The product was concentrated to obtain 42 g of crude crystals. The crude crystals were recrystallized from 150 ml of n-hexane to obtain 32 g of intended p-(2,6,10-trimethyl-1,5,9-undecatrienyl)benzoic acid as white crystals.

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