Abstract
Organic Chemistry Asymmetric catalysis is a commonly applied technique to prepare just one of two mirror-image products in a chemical reaction. But what if you already have the compound you want, stuck in a mixture of left- and right-handed enantiomers? Shin et al. now show that light-induced electron transfer can trigger a favorable succession of proton and hydrogen-atom transfer steps, both of which are susceptible to biasing by catalysts, to preferentially convert a mixture of cyclic urea enantiomers into just one (see the Perspective by Wendlandt). Science , this issue p. [364][1]; see also p. [304][2] [1]: /lookup/doi/10.1126/science.aay2204 [2]: /lookup/doi/10.1126/science.aay6919
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