title: Crystal structure of γ-methyl l-glutamate N-carb-oxy anhydride.
abstract: In the title compound, C7H9NO5, alternative name N-carb-oxy-l-glutamic anhydride γ-methyl ester, the oxazolidine ring is essentially planar with a maximum deviation of 0.020 (3) Å. In the crystal, mol-ecules are linked by N-H⋯O hydrogen bonds between the imino group and the carbonyl O atom in the methyl ester group, forming a tape structure along the a-axis direction. The tapes are linked by C-H⋯O inter-actions into a sheet parallel to the ac plane. The tapes are also stacked along the b axis with short contacts between the oxazolidine rings [C⋯O contact distances = 2.808 (4)-3.060 (4) Å], so that the oxazolidine rings are arranged in a layer parallel to the ab plane. This arrangement of the oxazolidine rings is very preferable for the polymerization of the title compound in the solid state.
authors.affiliation: Faculty of Symbiotic Systems Science, Fukushima University, Kanayagawa-1, Fukushima 960-1296, Japan.
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kanazawa
authors.affiliation: Faculty of Symbiotic Systems Science, Fukushima University, Kanayagawa-1, Fukushima 960-1296, Japan.
authors.forename: Aya
authors.initials: A
authors.lastname: Inada
authors.affiliation: Chemistry and Materials Science, Tokyo Institute of Technology, Ookayama-2, Meguro-ku, Tokyo 152-8551, Japan.
authors.forename: Aya
authors.initials: A
authors.lastname: Sakon
authors.affiliation: Chemistry and Materials Science, Tokyo Institute of Technology, Ookayama-2, Meguro-ku, Tokyo 152-8551, Japan.
authors.forename: Hidehiro
authors.initials: H
authors.lastname: Uekusa
keywords: amino acid N-carb­oxy anhydrides; crystal structure; hydrogen bonding; polymerization