title: Structures of (S)-(-)-4-oxo-2-azetidinecarboxylic acid and 3-azetidinecarboxylic acid from powder synchrotron diffraction data.
abstract: The crystal structures of the four-membered heterocycles (S)-(-)-4-oxo-2-azetidinecarboxylic acid (I) and 3-azetidinecarboxylic acid (II) were solved by direct methods using powder synchrotron X-ray diffraction data. The asymmetry of the oxoazetidine and azetidine rings is discussed, along with the hydrogen bonding.
authors.affiliation: Departamento de Química, Facultad de Ciencias, Universidad de Los Andes, Mérida 5101, Venezuela. asiloe@ula.ve
authors.forename: Asiloé J
authors.initials: AJ
authors.lastname: Mora
authors.forename: Michela
authors.initials: M
authors.lastname: Brunelli
authors.forename: Andrew N
authors.initials: AN
authors.lastname: Fitch
authors.forename: Jonathan
authors.initials: J
authors.lastname: Wright
authors.forename: Maria E
authors.initials: ME
authors.lastname: Báez
authors.forename: Francisco
authors.initials: F
authors.lastname: López-Carrasquero