Quadricyclane

[1] Because of quadricyclane's strained structure and thermal stability, it has been studied extensively.

The yield is higher for freshly distilled norbornadiene, but commercial reagents will suffice.

[4] When converted back to norbornadiene, ring strain energy is liberated in the form of heat (ΔH = −89 kJ/mol).

Quadricyclane's relative stability and high energy content have also given rise to its use as a propellant additive or fuel.

This property limits its applications, as propulsion systems may operate at temperatures exceeding 500 °C.