4-Pentyn-1-ol → 5-(2,5-Dichlorophenyl)pent-4-yn-1-ol

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Reaktionsschritte

A solution of 1,4-dichloro-2-iodobenzene (20.0 g, 73.3 mmol), 4-pentyn-1-ol (6.17 g, 73.3 mmol), bistriphenylphosphine(Pd II) chloride (1.03 g, 1.47 mmol), and copper(I) iodide (0.14 g, 0.733 mmol) in 400 ml of diethylamine was stirred under nitrogen for three days. This was diluted with dichloromethane and the oily layer was adsorbed onto silica gel and eluted with hexanes-ethyl acetate (5:1) to give 5-(2,5-dichlorophenyl)pent-4-yn-1-ol, 13.7 g (82%); NMR (CDCl3) δ 1.9 (m, 2H), 2.6 (t, 2H), 3.85 (t, 2H), 7.2 (dd, 1H), 7.28 (m, 1H), 7.4 (d, 2H).

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