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Herein, we report an unprecedented and general catalytic exhaustive reduction of carboxylic functional group straightforwardly to a methyl group. This reaction was achieved using earth\u2010abundant and readily available titanium as a catalyst. Our system has broad functional group tolerance and works for various other types of oxo\u2010chemicals such as alcohols, aldehydes, ketones, lactones, and carboxylates (&gt;100\u2005examples). 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