σ-aromaticity

σ-aromaticity in organic chemistry refers to a special case of aromaticity between sigma bond.

References

Intramolecular
(strong)

By symmetry	Sigma (σ) Pi (π) Delta (δ) Phi (φ)
By multiplicity	1 (single) 2 (double) 3 (triple) 4 (quadruple) 5 (quintuple) 6 (sextuple)
Miscellaneous	Agostic Bent Coordinate (dipolar) Pi backbond Charge-shift Hapticity Conjugation Hyperconjugation Antibonding
Resonant	Electron deficiency 3c–2e 4c–2e Hypercoordination 3c–4e Aromaticity Möbius super sigma homo bicyclo spiro σ-bishomo spherical Y-

Metal aromaticity

Intermolecular
(weak)

van der Waals forces	London dispersion
Hydrogen	Low-barrier Resonance-assisted Symmetric Dihydrogen bonds C–H···O interaction
Noncovalent other	Mechanical Halogen Chalcogen Aurophilicity Intercalation Stacking Cation–pi Anion–pi Salt bridge

Concepts in organic chemistry
Aromaticity Covalent bonding Functional groups Nomenclature Organic compounds Organic reactions Organic synthesis Publications Spectroscopy Stereochemistry List of organic compounds

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