1-[3-(Morpholin-4-yl)prop­yl]-4-(3-nitro­phen­yl)spiro­[azetidine-3,9′-xanthen]-2-one

The β-lactam (azetidin-2-one) ring of the title compound, C₂₈H₂₇N₃O₅, is nearly planar [maximum deviation = 0.010 (1) Å] and makes dihedral angles of 75.77 (5), 52.78 (9) and 88.72 (5)°, respectively, with the benzene ring, the least-squares plane formed by the four C atoms of the morpholine ring, which adopts a chair conformation, and the xanthene ring system. In the crystal, C—H...O hydrogen-bond contacts connect neighbouring mol­ecules into infinite zigzag chains running parallel to the b axis.

1-(Morpholin-4-yl)-4-(2-nitro­phen­yl)spiro­[azetidine-3,9′-xanthen]-2-one

In the title compound, C₂₂H₂₁N₃O₅, the β-lactam (azetidin-2-one) ring is nearly planar [maximum deviation = 0.010 (1) Å] and makes dihedral angles of 69.22 (5), 55.32 (5) and 89.42 (4)° with the least-squares planes formed by the four C atoms of the morpholine ring, which adopts a chair conformation, the benzene ring and the xanthene ring system, respectively. In the crystal, C—H...O hydrogen-bond contacts connect neighbouring mol­ecules into infinite zigzag chains running parallel to the b axis.

(E)-4-{[(Morpholin-4-yl)imino]­meth­yl}benzo­nitrile

In the title compound, C₁₂H₁₃N₃O, the morpholine ring adopts a chair conformation and its mean plane is inclined to that of the benzene ring by 16.78 (12)°. The N-N=C-C bridge, which has an E conformation, has a torsion angle of 173.80 (19)°. In the crystal, mol­ecules stack along the a axis but there are no significant inter­molecular inter­actions present.

1-[3-(Morpholin-4-yl)prop­yl]-3-[(naph­tha­len-2-yl)oxy]-4-(3-nitro­phen­yl)azeti­din-2-one

In the title compound, C₂₆H₂₇N₃O₅, the β-lactam (azetidin-2-one) ring is nearly planar [maximum deviation = 0.011 (3) Å]. The mean plane formed by the four C atoms of the morpholine ring, which adopts a chair conformation, the benzene ring and the naphthalene ring system form dihedral angles of 72.85 (17), 87.46 (15) and 65.96 (11)°, respectively, with the β-lactam ring. In the crystal, molecules are linked via C—H...O hydrogen bonds, forming inversion dimers with R₂²(8).

3-(2,4-Di­chloro­phen­oxy)-1-(4-meth­oxy­benz­yl)-4-(4-nitro­phen­yl)azetidin-2-one

The β-lactam ring of the title compound, C₂₃H₁₈Cl₂N₂O₅, is nearly planar [maximum deviation = 0.019 (2) Å for the N atom] and its mean plane makes dihedral angles of 56.86 (15), 68.83 (15) and 83.75 (15)° with the di­chloro-, nitro- and meth­oxy-substituted benzene rings, respectively. In the crystal, mol­ecules are linked by pairs of C—H...O hydrogen bonds, forming inversion dimers with R₂²(10) loops. The dimers are linked by further C—H...O hydrogen bonds, forming sheets lying parallel to (001). The mol­ecular packing is further stabilized by C—H...π inter­actions.