The X-ray crystal structure of racyclo-[6.2.1.1(3.6).0(2,7)]dodec-9-en
-anti-11-yl p-bromobenzoate, C19H19BrO2 (1), was determined at 148 K.
The molecule consists of norbornene with an anti-p-bromobenzoate subst
ituent at the methano bridge and an exo-norbornyl unit endo-fused to t
he ethano bridge. Structural comparisons are made with another derivat
ive and steric interactions examined. The distance from the norbornyl
methano bridge to the norbornene etheno bridge is consistent with lati
cyclic hyperconjugation in (1).