Imidazole → 1,4-Dichloro-2-(5-iodopent-1-ynyl)benzene

Beteiligte Stoffe

Reaktionsschritte

5-(2,5-Dichlorophenyl)pent-4-yn-1-ol (13.7 g, 59.8 mmol), triphenylphosphine (20.4 g, 77.8 mmol), and imidazole (5.71 g, 83.8 mmol) in a mixed solvent (100 ml acetonitrile-150 ml ether) was stirred under nitrogen at 0° C., and to this was slowly added iodine (21.3 g, 83.8 mmol). The solution was allowed to warm to room temperature and stirring was continued for 18 hours. This was chromatographed on silica gel with hexane to give the title compound (14.7 g, 72%), MS m/z 337.9 In the manner described in Example 30, above, the following alcohols in Table III were converted to the corresponding bromides:

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