Structure of exo, endo, exo, exo-2,3,5,6-tetrabromonorbornane

Abstract

Abstract The compound, C7H8Br4, crystallizes in the triclinic space group P[unk] with a = 6.280(2) Å, b = 6.646(3) Å, c = 12.385(6) Å, α = 96.58(4)°, β = 90.50(3)°, γ = 101.10(2)°, (V = 503.6(3) Å3, Z = 2, D x = 2.715 Mgm−3; Patterson method; 1542 hkl with I > 2σ(I); R = 0.048). The dihedral angles between the planar fragments C1–C2–C3 i –C4 i (A), C4 i –C7–C1 (B) and C4 i –C5–C6–C1 (C)are 112.3(6)°, 124.5(8)° and 123.1(8)° for A–B, B–C and A–C, respectively. The deformations in the six-membered rings induced by the different substituents and by the methylene bridge show some difference with respect to the ideal values reported for a boat conformation. This difference reverberate on the internal torsion angles (C1 to C6: −0.7(9)°, −69.2(9)°, 65.8(9)°, 7.0(8)°, −76.6(8)° and 72.1(8)°).