Dicyclohexylcarbodiimide → HCID 178444552, compound

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A mixture of 800 mg of trans-4-(trans-1-pentenyl)cyclohexanecarboxylic acid, 675.64 mg of p-ethoxyphenol, 1.01 g of dicyclohexylcarbodiimide and 49.79 mg of 4-(dimethylamino)pyridine was suspended in 14.5 ml of methylene chloride and stirred at room temperature for 20 hours. The mixture was subsequently diluted with diethyl ether, the precipitated urea was filtered off and the filtrate was concentrated. The residue was taken up in hexane and washed with dilute hydrochloric acid, sodium hydrogen carbonate solution and water. The aqueous phases were back-extracted twice with hexane. The organic phases were dried over magnesium sulphate and evaporated. Low-pressure chromatography of the resulting residue on silica gel with ethyl acetate/petroleum ether (vol. 3:97) gave 1.080 g (83.8%) of trans-4-(trans-1-pentenyl)cyclohexanecarboxylic acid p-ethoxyphenyl ester. After recrystallization from 40 ml of hexane, there were finally obtained 880 mg of product in the form of transparent crystals; m.p. (C--N) 57.2° C., cl.p. (N--I) 93.1° C.

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