A norbornenyl derivative with through‐space ketone π‐interaction

The title compound, endo,exo‐12‐oxotetra­cyclo­[6.2.1.1^3,6.0^2,7]­dodeca‐9‐en‐anti‐11‐yl p‐bromo­benzoate, C₁₉H₁₇BrO₃, con­sists of norbornene with an anti‐p‐bromo­benzoate substituent at the methano bridge and an exo‐fused norbornanone unit bonded to the ethano bridge. The spatially proximate ketone and alkene interact through space and the ketone C atom is substantially pyramidalized. Through‐space ketone π‐inter­action is probably responsible for the low solvolysis rate of the anti‐11‐chloride derivative.