Fenbufen → (1,1'-Biphenyl)-4-butanoic acid, gamma-hydroxy-

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The compound 5-(4-biphenylyl)dihydro-2-(3H)-furanone may be prepared by treating 3-(4-biphenylylcarbonyl)-propionic acid in basic medium with sodium borohydride. The addition of acetic acid precipitates a solid which is again treated with sodium borohydride in basic medium, and precipitated with glacial acetic acid giving 4-(4-biphenylyl)-4-hydroxybutyric acid. This product is treated with a mineral acid and then neutralized with sodium acetate giving the desired product.

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