Structure of (3aα,4α,7α,7aα)-2,2-dimethyl-3a,4,7,7a-tetrahydro-1,3-benzodioxolane-4,7-diamine

C 9 H 16 N 2 O 2 , M r =184.2, rhombohe dral, R3, a=12.594 (2) A, α=118.03 (1) o , V=720 (2) A 3 , Z=3, D x =1.274 Mg m -3 , A(Cu Kα)= 1.5418 A, μ=0.70 mm -1 , F(000)=300, T=290 (1) K, final R=0.047 for 1191 reflections with I ≥2σ(I). Although the title molecule (I) is a meso compound, it does not have exact mirror symmetry in the solid state. The observed distortions, which no doubt arise from the fusion of the two rings, results in two enantiomeric forms with any given crystal containing only the one enantiomer (e.g. with 3aS, 4R,7S,7aR configurations)