organic compounds
Open access
In the title compound, C15H10O5, the cyclopentanone (r.m.s. deviation = 0.049 Å) and oxolane (r.m.s. deviation = 0.048 Å) rings make a dihedral angle of 67.91 (4)°. An intramolecular O—HO hydrogen bond is observed. In the crystal, molecules associate via O—HO hydrogen bonds, forming a three-dimensional network.
organic compounds
Open access
In the title compound, C9H13N2O+·Cl−, the cation, apart from the methyl groups, is almost planar, with a maximum deviation of 0.040 (1) Å; the methyl C atoms deviate by 0.389 (2) and −1.247 (1) Å, from the mean plane. In the crystal, cations and anions associate through C—HCl hydrogen bonds, forming a helical arrangement. In addition, intermolecular O—HCl, N—HCl and C—HN interactions are observed.