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A suspension of 6.4 g of methoxymethyl-triphenylphosphonium chloride in 80 ml of t-butyl methyl ether was treated within 3 minutes with 2.1 g of potassium t-butylate while gassing with argon at 0° C. and the mixture was stirred for a further 1 hour at 0°-5° C. The mixture was then treated dropwise within 5 minutes at 0° C. with a solution of 3.0 g of 3-[trans-4-(p-cyanophenyl)cyclohexyl]propionaldehyde in 20 ml of t-butyl methyl ether and the resulting mixture was stirred for a further 2 hours at room temperature. The reaction mixture was subsequently poured into 100 ml of water and extracted three times with 100 ml of diethyl ether each time. The organic phases were washed twice with 100 ml of water each time, dried over magnesium sulphate and concentrated. The residue was dissolved in 15 ml of ethyl acetate and the clear solution was treated with 250 ml of petroleum ether. After leaving to stand for 10 minutes at -20° C. the precipitated triphenylphosphine oxide was filtered off and the filtrate was concentrated to dryness. Low-pressure chromatography (0.5 bar) of the residue (5.5 g) on silica gel with ethyl acetate/petroleum ether (vol. 5:95) gave 2.95 g (88%) of p-[trans-4-(4-methoxy-3-butenyl)cyclohexyl]benzonitrile as colourless crystals.

1. customwhile gassing with argon at 0° C.
2. stirringthe resulting mixture was stirred for a further 2 hours at room temperature
3. extractionextracted three times with 100 ml of diethyl ether each time
4. washThe organic phases were washed twice with 100 ml of water each time
5. dry with materialdried over magnesium sulphate
6. concentrationconcentrated
7. dissolutionThe residue was dissolved in 15 ml of ethyl acetate
8. additionthe clear solution was treated with 250 ml of petroleum ether
9. customAfter leaving
10. waitto stand for 10 minutes at -20° C.
11. filtrationthe precipitated triphenylphosphine oxide was filtered off
12. concentrationthe filtrate was concentrated to dryness