Abstract

Catalysis Catalysts accelerate chemical reactions by breaking existing bonds and then forming new ones. Often, the factors that favor the first process can muddle the second one, constraining a catalyst's generality. Torres et al. found that visible light excitation of a palladium complex can facilitate both the breaking and making of carbon-halogen bonds (see the Perspective by Kathe and Fleischer). The reaction specifically forms acid chlorides by carbonylation of a wide variety of alkyl or aryl bromides and iodides. These products in turn can react further to form amides and esters. Science , this issue p. [318][1]; see also p. [242][2] [1]: /lookup/doi/10.1126/science.aba5901 [2]: /lookup/doi/10.1126/science.abb2104

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