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In the case of the homologue of (10 ) with 10 instead of nine methylene groups in the chain good yields were only achieved if the reaction was carried out as follows: Butyllithium (13.33 ml, 28 mmol, 2.1 M) was added to a stirred solution of diisopropylamine (3.73 ml, 26.66 mmol) in dry THF (120 ml) at -78°C under argon. The mixture was allowed to reach room temperature and stirred for 15 min. It was then cooled to -78°C and the ester (4.17 g, 12.12 mmol) in dry THF (45 ml) was added. The mixture was allowed to warm to -5°C over 2 h, stirred at 0-2°C for 0.5 h, then cooled to -70°C and 1-iodoprop-2-ene (1.55 ml, 17.0 mmol) and HMPA (6.32 ml, 36.4 mmol) in dry THF (10 ml) were added. The reaction was allowed to reach 0°C over 1.5 h and then quenched with aq ammonium chloride (10 ml) followed by brine (100 ml). The product was extracted with petrol-ethyl acetate (1/1, 3×100 ml). The combined organic layers were washed with water, dried and evaporated to give a pale yellow oil. Column chromatography eluting with 5:2 petrol and ethyl acetate gave the product as a colourless oil (2.56 g, 56%) (Al-Dulayymi, J. R. and Koza, G. Unpublished results).
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