Crystal structure of γ-ethyl-l-glutamate N-carb-oxy anhydride

Abstract

In the title compound (alternative name N-carboxy-l-glutamic anhydride γ-ethyl ester), C8H11NO5, the oxazolidine ring is essentially planar, with a maximum deviation of 0.019 (2) 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 ethyl ester group, forming a tape structure along the c-axis direction. The oxazolidine rings of adjacent tapes are arranged into a layer parallel to the ac plane. This arrangement is favourable for the polymerization of the title compound in the solid state.

Keywords: amino acid N-carb­oxy anhydrides; crystal structure; hydrogen bonding; solid-state polymerization.

Figure 1

The mol­ecular structure of the title compound showing atom labels and 50% probability displacement ellipsoids for non-H atoms.

Figure 2

A crystal packing diagram of the title compound, viewed approximately along the a axis, showing the hydrogen bonds as dashed lines (see Table 1 ▸ for details).

Figure 3

A view of the structural overlay of the title compound (blue) and ANCBGL (red; Kanazawa et al., 1978 ▸).