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Chemoselective hydrogenation of arenes in the presence of ketones. A) Effect of a Lewis acid on the partial hydrogenation of phenol (27). B) Chemoselective hydrogenation of aromatic ketones (30) using rhodium-CAAC complexes (e.g. 33). C) Chemoselective partial hydrogenation of 3-hydroxypyridinium salts (34). COD=1,5-cyclooctadiene, DCE=1,2-dichloroethane, TFE=2,2,2-trifluoroethanol.
