On a direct course to the aldehyde: Hydrosilylation catalyzed by a well-defined N-heterocyclic-carbene–iron complex under UV irradiation enabled the selective reduction of esters to aldehydes (see scheme; Bn=benzyl, Mes=mesityl). The low catalyst loading and very mild reaction conditions make this chemoselective transformation a promising alternative to the reduction of esters with diisobutylaluminum hydride.
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