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For questions concerning all aspects of pericyclic reactions, their use in synthesis, and the orbital analyses used to describe them.

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How fast is the interconversion triplet → singlet in organic molecules?

It depends on the organic molecule. When spin-orbit coupling facilitates intersystem crossing, it can be fast: 100 femtoseconds for nitronapthalene (viz. Chem. Eur. J. 2018, 24, 5379 – 5387). The Wi …
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