The Electron Localizability Indicator from X‐Ray Diffraction Data—A First Application to a Series of Epoxide Derivatives

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No longer hidden! An extension of the capabilities of the X‐ray diffraction experiment is introduced. Locations of electron pairs within a molecule can be measured and made visible (see figure). This is demonstrated on a series of epoxides, for which ring strain, crystal, and substituent effects can be quantified. Comparison with experimental and theoretical electron‐density analyses shows the advantages of the new method.