Saytzeff's rule is the result of empirical observations, and can be used to predict the outcome of elimination reactions. Now, ab initio calculations have provided the long-sought evidence to show that hyperconjugation is the key that unlocks the origin of this rule.
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Webber, M., Spivey, A. Supporting Saytzeff. Nature Chem 1, 435–436 (2009). https://doi.org/10.1038/nchem.348
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DOI: https://doi.org/10.1038/nchem.348