Two oxazane macrocycles.

The 20-membered ring in 1,7,11,17-tetraoxa-2,6,12,16-tetraazacycloeicosane tetrahydrochloride, C₁₂H₃₂N₄O₄⁴·4Cl^-, adopts an endo conformation, while the 18-membered ring in 1,6,10,15-tetraoxa-2,5,11,14-tetraazacyclooctadecane tetrahydrochloride, C₁₀H₂₈N₄O₄⁴⁺·4Cl^-, lies about an inversion centre and adopts a symmetrical conformation. In the crystal structures of both compounds, the cations and chloride anions are linked by N-H···Cl hydrogen bonds into planar sheets of molecules; the sheets are linked into three-dimensional networks via C-H···Cl hydrogen bonds. [ABSTRACT FROM AUTHOR]