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Bredt Rule Assessment
Evaluating...
Trappable Intermediate
p-Orbital Misalignment (θ)
54.2°
Dihedral angle from parallel
π-Overlap Integral (S)
0.38
Normal alkene S ≈ 0.85
Steric Ring Strain (ΔE)
42.5 kcal/mol
Severe Torsional Strain
Canonical Model Output & State Proof
Initializing system metrics...
Presets & Classical Cases
Bridge Topology Configuration
Bridge k Length (Main Ring):
2
Bridge l Length (Second Ring):
2
Bridge m Length (Zero/Zero-Plus):
1
Manual Bridgehead Twist (°):
0.0°
Chemical Context
Bredt's Rule & Modern Breakthroughs
Bredt's rule states that double bonds cannot reside at bridgeheads of small bridged ring systems because rigid ring geometry prevents parallel p-orbital alignment.
In 2024, Garg et al. generated fleeting anti-Bredt alkenes via fluoride-induced precursor elimination and trapped them in-situ with Diels-Alder dienes, overturning a 50-year dogma.