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0 °C

A suspension of 22.2 g of methoxymethyl-triphenylphosphonium chloride in 150 ml of t-butyl methyl ether was treated with 7.4 g of solid potassium t-butylate at 0° C. within 3 minutes while gassing with argon in a sulphonation flask provided with a mechanical stirrer. The orange suspension was stirred at 0° C. for 1 hour and then treated dropwise within 10 minutes with a solution of 9.8 g of 2-[trans-4-(p-cyanophenyl)cyclohexyl]acetaldehyde in 100 ml of tetrahydrofuran. Subsequently, the suspension was left to warm slowly to room temperature while stirring. After 15 hours, the suspension was partitioned three times in diethyl ether/water. The organic extracts were washed twice with water, dried over magnesium sulphate, filtered and evaporated. In order to separate triphenylphosphine oxide, the residue was dissolved in ethyl acetate and the solution was diluted with petroleum ether, filtered and evaporated. Chromatographic separation of the resulting, yellowish oil (13.7 g) on silica gel with ethyl acetate/petroleum ether (vol. 5:95) gave 10.5 g (96%) of p-[trans-4-(3-methoxy-2-propenyl)cyclohexyl]benzonitrile as a colourless oil.

1. customwhile gassing with argon in a sulphonation flask
2. customprovided with a mechanical stirrer
3. waitSubsequently, the suspension was left
4. temperatureto warm slowly to room temperature
5. stirringwhile stirring
6. waitAfter 15 hours
7. customthe suspension was partitioned three times in diethyl ether/water
8. washThe organic extracts were washed twice with water
9. dry with materialdried over magnesium sulphate
10. filtrationfiltered
11. customevaporated
12. customIn order to separate triphenylphosphine oxide
13. dissolutionthe residue was dissolved in ethyl acetate
14. additionthe solution was diluted with petroleum ether
15. filtrationfiltered
16. customevaporated
17. customChromatographic separation of the resulting, yellowish oil (13.7 g) on silica gel with ethyl acetate/petroleum ether (vol. 5:95)