Anti-Bredt Alkene Geometry & Orbital Strain Explorer

p-Orbital Lobes

Strain Heatmap

Atom Labels

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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

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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.

Anti-Bredt Alkene Orbital Misalignment & Trapping Mechanics

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Read the explanation

In planar alkenes, adjacent parallel p-orbitals overlap efficiently to form a stable pi bond. Bridgehead double bonds twist this geometry. In compact bicyclic rings, bridge constraints force dihedral twisting theta up to fifty-four degrees, dropping overlap integral S toward zero point three eight. Torsional and ring deformation accumulate over forty-two kilocalories per mole of strain energy, driving the model past its thirty kilocalorie stability boundary. Triggering the Diels-Alder trap quenches the strained intermediate in-situ, capturing fleeting anti-Bredt alkenes into stable bicyclic adducts.