Add time:07/21/2019         Source:sciencedirect.com

Flobufen, 4-(2′,4′-difluorobiphenyl-4-yl)-2-methyl-4-oxobutanoicacid, and its 3-methyl isomer have been obtained by the Friedel-Crafts reaction of 2,4-difluorobiphenyl with itaconic or citraconic anhydride, respectively, followed by hydrogenation of the products. The structures of both compounds have been elucidated by mass spectrometry and 1H, 13C and 19F NMR spectroscopy. The structure of flobufen has been confirmed by a single-crystal X-ray study.

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