ABSTRACT
In the title compound, C17H15NO4 (alternative name; O-benzyl-l-tyrosine N-carb-oxy anhydride), the oxazolidine ring is planer, with an r.m.s. deviation of 0.039â Å. The benz-yloxy and benzyl rings are almost coplanar, making a dihedral angle of 0.078â (10)°, and are inclined to the oxazolidine ring by 59.16â (11) and 58.42â (11)°, respectively. In the crystal, mol-ecules are linked by N-Hâ¯O and C-Hâ¯O hydrogen bonds, forming ribbons propagating along [010]. The ribbons are linked by C-Hâ¯π inter-actions, forming a three-dimensional supra-molecular structure. The oxazolidine rings of adjacent ribbons are arranged into a layer parallel to the ab plane. This arrangement is favourable for the polymerization of the compound in the solid state.
ABSTRACT
In the title racemic compound, C12H11NO5 [systematic name: benzyl 2-(2,5-dioxooxazolidin-4-yl)acetate], the oxazolidine ring is planar, with an r.m.s. deviation of 0.03â Å. The benzyl ring is almost normal to the oxazolidine ring, making a dihedral angle of 80.11â (12)°. In the crystal, inversion dimers are formed between the l- and d-enanti-omers via pairs of N-Hâ¯O hydrogen bonds. This arrangement is favourable for the polymerization of the compound in the solid state. The dimers are linked by C-Hâ¯O hydrogen bonds, forming layers parallel to the ab plane.
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 0.020â (3)â Å. In the crystal, mol-ecules are linked by N-Hâ¯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-Hâ¯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 [Câ¯O contact distances = 2.808â (4)-3.060â (4)â 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.
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 0.019â (2)â Å. In the crystal, mol-ecules are linked by N-Hâ¯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.