Hexane → p-[4-(Methoxymethylene)cyclohexyl]benzonitrile

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10.4 g of triphenyl-methoxymethyl-phosphonium chloride were suspended in 60 ml of t-butyl methyl ether while gassing with argon in a sulphonation flask provided with a thermometer, mechanical stirrer, dropping funnel and solid substance addition tube and treated at -10° C. within 10 minutes with 3.6 g of solid potassium t-butylate. After completion of the addition, the mixture was stirred at -10° C. to 0° C. for a further 30 minutes and then the deep orange, heterogenous mixture was treated dropwise at 0° C. with a solution of 4.2 g of 4-(p-cyanophenyl)cyclohexanone in 50 ml of absolute tetrahydrofuran. The mixture was subsequently stirred at room temperature for a further 2 hours, then poured into 500 ml of hexane and filtered. Low-pressure chromatography (0.5 bar) of the concentrated residue (7.1 g) on silica gel with ethyl acetate/petroleum ether (vol. 5:95) gave 4.5 g (94%) of p-[4-(methoxymethylene)cyclohexyl]benzonitrile as a colourless oil; purity 95%, Rf-value (ethyl acetate/petroleum ether vol. 1:9) 0.30.

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