Aya Inada

Crystal structure of β-benzyl dl-aspartate N-carb­oxyanhydride

In the title racemic compound, the benzyl ring is almost normal to the oxazolidine ring, with a dihedral angle of 80.11 (12)°. In the crystal, inversion dimers are formed between the l- and d-enantiomers via pairs of N—H⋯O hydrogen bonds.

Crystal structure of O-benzyl-l-tyrosine N-carb­oxy anhydride

In the title compound, known also as (S)-4-[4-(benzyloxy)benzyl]oxazolidine-2,5-dione, the benzyloxy and benzyl rings are almost coplanar, making a dihedral angle of 0.078 (10)°, and are inclined to the oxazolidine ring by 59.16 (11) and 58.42 (11)°, respectively.

Crystal structure of γ-methyl l-glutamate N-carb­oxy anhydride

Solid-state polymerization behavior of amino acid N-carboxy anhydrides is explained by the very preferable molecular arrangement for the reaction in the crystal structure.

Crystal structure of γ-ethyl-l-glutamate N-carb­oxy anhydride

In the crystal of the title compound, molecules 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, which is a favourable arrangement for the polymerization of the title compound in the solid state.

Crystal structure of γ-methyl L-glutamate N-carboxy anhydride

Solid-state polymerization behavior of amino acid N-carboxy anhydrides is explained by the very preferable molecular arrangement for the reaction in the crystal structure.