反应详情

Palladium on carbon (5% w/w, 0.1 g.) was added to a solution of 2-[4-(4-chlorophenyl)-phenyl]-5,5-dimethyl-1,3-dioxolan-4-one (0.3 g.) in ethanol (50 ml.). The suspension was treated with hydrogen gas at 25° C. and atmospheric pressure for 1.5 hours. The catalyst was removed by filtration and the filtrate evaporated. The residue was dissolved in toluene (10 ml.) and the solution obtained was extracted with 1 M sodium hydroxide solution (10 ml.). The aqueous extracts were acidified with 2 M hydrochloric acid and extracted with toluene (2×10 ml.). By evaporation of the toluene extracts, there may thus be obtained 2-[4-(4-chlorophenyl)benzyloxy]-2-methylpropionic acid, as a waxy solid equivalent to that obtained in Example 12.

1. customThe catalyst was removed by filtration
2. customthe filtrate evaporated
3. dissolutionThe residue was dissolved in toluene (10 ml.)
4. customthe solution obtained
5. extractionwas extracted with 1 M sodium hydroxide solution (10 ml.)
6. extractionextracted with toluene (2×10 ml.)
7. customBy evaporation of the toluene