Carbon tetrabromide → 4-(6-Bromohexyl)-3-(3-ethoxy-3-oxopropyl)benzenepentanoic Acid Ethyl Ester

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Reaction Steps

A mixture of 0.673 g (1.65 mmol) of 3-(3-ethoxy-3-oxopropyl)-4-(6-hydroxyhexyl)benzenepentanoic acid ethyl ester from the preceding example, 1.1 g (3.3 mmol) of carbon tetrabromide, and 0.9 g (3.3 mmol) of triphenylphosphine in 25 mL of ether was stirred at room temperature for 23 hr. The mixture was diluted with 250 mL of ether, and the solution worked-up in the usual manner. The crude product was purified by flash chromatography on 80 g of silica gel, eluting with hexane-ethyl acetate (10:1). There was obtained 0.588 g (75.7%) of the title compound as a colorless oil.

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