Gauche Effect · 1,2-difluoroethane
unseel.com · FCH₂–CH₂F · gauche beats anti by ~3 kJ/mol
FCCF dihedral 180°
ΔE vs anti 0.0 kJ/mol
state —
carbon (sp³)
fluorine (C–F)
σC–H → σ*C–F overlap
gauche stabilization
Unseel.com · The Gauche Effect