organic compounds
Open access
The title compound, C11H13NO6, exhibits an intramolecular O–HO=C hydrogen bond between the N-hydroxyl H atom and carbonyl O atom of the neighboring acetyl group. This finding contradicts a previously published model in which the hydrogen bond was postulated to occur with the neighboring carbomethoxy group. This relatively strong hydrogen bond [O—HO: D = 2.5583 (11) Å and θ = 152°] may underlie the resistance of the title compound to oxidation into the corresponding nitroxide.
research communications
Open access
The title salt crystallized with two anions and two cations in the asymmetric unit, together with three water molecules. In the crystal, the anions are linked via O—HO hydrogen bonds, involving the water molecules, forming chains along [100] and the cations are linked to these chains by N—HO hydrogen bonds.