2-Propenoic acid, 3-(2-chloro-4-fluorophenyl)- → 3-(2-Chloro-4-fluorophenyl)propanoic acid

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A mixture of 2-chloro-4-fluorocinnamic acid (22.9 g, 0.11 mol) and platinum oxide hydrate (0.5 g, EM Scientific) in 95% ethanol (140 ml) was placed on a Parr hydrogenation apparatus. After the appropriate amount of hydrogen was taken up, the catalyst was filtered and the mixture was concentrated in vacuo to give 22.6 g (98%) of 3-(2-chloro-4-fluorophenyl)propanoic acid as a purple solid. This material was used without further purification.

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