The -C-H bond formylation of arenes has been achieved using CHBr as a formyl source in the presence of [Ru(-cym)(OAc)] as a catalyst. This method provides efficient access to the preparation of various -substituted aromatic compounds, such as alcohols, ethers, amines, nitriles, alkenes, halogens, carboxylic acids, and their derivatives, through transformation of the versatile formyl group. Furthermore, mechanistic studies show that the key active species is a pentagonal ruthenacycle complex.
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