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To a degassed, cooled (0° C.) solution of triisopropylsilylsulfide (11.1 g, 58.6 mmol) in tetrahydrofuran (60 ml) was added portionwise over 10 minutes sodium hydride (2.34 g, 60% dispersion in oil) and the mixture stirred until a clear solution formed. 1,1,2,2,3,3,4,4,4-Nonafluorobutane-1-sulfonic acid 4-cyano-4-cyclopropylmethylcyclohex-1-enyl ester (26.9 g, 58.6 mmol) was dissolved in anhydrous toluene (170 ml) and degassed for 30 minutes before addition of TIPS sodium sulfide solution and tetrakis triphenylphosphine palladium (0) (3.38 g, 2.93 mmol). On complete addition the mixture was plunged into an oil bath preheated to 90° C. After 15 min the mixture becomes dark brown in colour. After a further 15 min the mixture was allowed to cool to ambient temperature. The mixture was poured on to ice (200 g) and extracted with diethyl ether (2×200 ml). The combined organic layer was washed with water (200 ml), dried over anhydrous sodium sulphate, filtered and evaporated to give a brown oil. The oil was purified by dry flash column chromatography on silica eluting with isohexane on a gradient of dichloromethane (5-30%). Collecting appropriate fractions followed by evaporation gave a brown oil (20.5 g, 100%). 1H NMR δ (ppm)(CDCl3): 5.92 (1H, s), 2.61-2.54 (2H, m), 2.38-2.28 (1H, m), 2.21-2.10 (3H, m), 1.67-1.44 (2H, m), 1.33-1.23 (3H, m), 1.14 (18H, d, J=7.2 Hz), 0.95-0.85 (1H, m), 0.58-0.55 (2H, m), 0.20-0.18 (2H, m).

1. customformed
2. additionOn complete addition the mixture
3. customwas plunged into an oil bath
4. custompreheated to 90° C
5. waitAfter a further 15 min the mixture was allowed
6. extractionextracted with diethyl ether (2×200 ml)
7. washThe combined organic layer was washed with water (200 ml)
8. dry with materialdried over anhydrous sodium sulphate
9. filtrationfiltered
10. customevaporated
11. customto give a brown oil
12. customThe oil was purified
13. dry with materialby dry flash column chromatography on silica eluting with isohexane on a gradient of dichloromethane (5-30%)
14. customCollecting appropriate fractions
15. customfollowed by evaporation