Inside Cover: Exceptionally Long C−C Single Bonds in Diamino‐o‐carborane as Induced by Negative Hyperconjugation (Angew. Chem. Int. Ed. 5/2019).

A series of 1,2‐diamino‐o‐carboranes with exceptionally long C−C bonds (up to 193 pm) were synthesized. In their Communication on page 1397 ff., Z. Li, X.‐Q. Xiao et al. attribute this bond elongation to the in‐plane negative hyperconjugation between the lone pairs of the nitrogen atoms and the σ*C−C orbital in the o‐carborane. In the artwork, two red‐crowned cranes are holding this molecule, stretching the C−C bond almost to breaking point (depicted by the "Broken Bridge", Hangzhou). [ABSTRACT FROM AUTHOR]