3-Oxapentane-1,5-diyl dicarbamate

The complete molecule of the title compound, C6H12N2O5, is generated by a rotation about a twofold axis. The conformation along the bond sequence linking the two amino groups is trans-trans-(+)gauche-trans-trans. In the crystal, N—H⋯O hydrogen bonds link the molecules into a three-dimensional supramolecular architecture.

The complete molecule of the title compound, C 6 H 12 N 2 O 5 , is generated by a rotation about a twofold axis. The conformation along the bond sequence linking the two amino groups is trans-trans-(+)gauche-trans-trans. In the crystal, N-HÁ Á ÁO hydrogen bonds link the molecules into a three-dimensional supramolecular architecture.
The title compound contains one half-molecule as it is disposed about a crystallographic twofold axis with the O3 atom lying on the axis (Fig. 1). The conformation along the bond sequence linking the two amino groups is trans-  Table 1).
After cooling to room temperature, the solvent was evaporated under vacuum. The residue was subjected to flash chromatography and the title compound was obtained as colourless crystals (0.97 g; Yield: 50%; M.pt: 428-429 K).
Crystals were grown by slow evaporation from its DMF solution.

Refinement
Carbon-bound H-atoms were placed in calculated positions (C-H = 0.97 Å) and were included in the refinement in the riding model approximation, with U iso (H) set to 1.2U eq (C). The amino group H-atoms were located in a difference Fourier map, and were refined freely.