Karplus Equation · ³J vs dihedral angle
unseel.com · ³J = A cos²θ + B cosθ + C · H–C–C–H
θ (dihedral) 180°
³J coupling 9.2 Hz
State
Front C–H (HA)
Back C–H (HB)
Karplus curve · ³J(θ)
NMR doublet splitting
Unseel.com · The Karplus Equation