Abstract
Remember how it was …︁? A mechanistic explanation for the chiral-memory effect in Norrish–Yang photoreactions has been obtained by computing the reaction pathway (see figure) at the ab initio level. The results show that both the ultrafast excited-state decay, which occurs at a conical intersection (CI), and the specific hydrogen-bonded structure of the primary diradical intermediate determine the high stereoselectivity of the reaction.
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