Catalytic reduction of carboxylic acids and derivatives all the way to their corresponding methyl-compounds is very rare and still challenging for homogeneous transition-metal catalysis. 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-abundant and readily available titanium as a catalyst. Our system has broad functional group tolerance and works for various other types of oxo-chemicals such as alcohols, aldehydes, ketones, lactones, and carboxylates (>100 examples). Preliminary mechanistic studies revealed that the in situ-generated TiIII -H species was vital for this transformation.
Keywords: Carboxylic Acids; Exhaustive Reduction; Methyl Group; Oxo-Chemicals; Titanium.
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