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

In the title compound, C22H16Cl2N2O5, the nearly planar four-membered β-lactam ring [maximum deviations of 0.011 (2) for the N atom] makes dihedral angles of 68.34 (13), 83.04 (13) and 3.37 (13)° with the dichloro-, nitro- and meth­oxy­phenyl rings, respectively. The crystal structure is stabilized by C—H⋯O hydrogen-bond inter­actions. In addition, a π–π stacking inter­action [centroid–centroid distance = 3.6622 (12) Å] is observed between the β-lactam and nitro­phenyl rings

3,4-Dimeth­oxy-N-(3-nitro­benzyl­idene)aniline

The title compound, C15H14N2O4, has two crystallographically independent mol­ecules in the asymmetric unit. In both mol­ecules, the nitro and the two meth­oxy substituents are coplanar with the benzene rings to which they are attached. The benzene rings are nearly coplanar, with dihedral angles between the two benzene rings of 10.39 (8) and 5.95 (8)° in the two mol­ecules. The two independent mol­ecules in the asymmetric unit are rotated with respect to each other such that the dihedral angles between equivalent benzene rings are 49.11 (8) and 63.93 (8)°. In the crystal structure, inter­molecular C—H⋯O hydrogen-bond contacts and a weak C—H⋯π inter­action are observed

1-(4-Meth­oxy­phen­yl)-4-(3-nitro­phen­yl)-3-phen­oxy­azetidin-2-one

In the title compound, C22H18N2O5, the four-membered β-lactam ring is nearly planar, with a maximum deviation of 0.023 (2) Å for the N atom, and has long C—C distances of 1.525 (5) and 1.571 (5) Å. The mean plane of this group makes dihedral angles of 11.61 (19), 74.5 (2) and 72.3 (2)° with three aromatic rings. An intra­molecular C—H⋯O hydrogen bond occurs. The packing of the mol­ecules in the crystal structure is governed mainly by inter­molecular C—H⋯O hydrogen-bonding and C—H⋯π stacking inter­actions. Furthermore, a π–π inter­action [centroid–centroid distance = 3.6129 (19) Å] helps to stabilize the crystal structure

2-[(E)-(4-Methyl­phen­yl)imino­meth­yl]-6-(morpholin-4-ylmeth­yl)phenol

In the title compound, C19H22N2O2, the morpholine ring adopts an almost perfect normal chair conformation with puckering parameters Q T, θ and ϕ of 0.5642 (18) Å, 177.32 (17) and ϕ = 10 (4)°, respectively. The two benzene rings make a dihedral angle of 42.67 (8)° with each other. An intra­molecular O—H⋯N hydrogen bond helps to stabilize the mol­ecular conformation. Aromatic C—H⋯π inter­actions and π–π stacking inter­actions [centroid–centroid distance = 3.6155 (15) Å] between the benzene rings contribute to the stabilization of the crystal structure

4-(9-Anthr­yl)-1-(2-methoxy­phen­yl)spiro­[azetidin-3,9′-xanthen]-2-one

The stabilized conformation of the title compound, C36H25NO3, 4-(9-anthryl)-1-(2-methoxyphenyl)-spiro[azetid­in-3,9′-xanthen]-2-one, may be compared with that of the isomeric compound 4-(9-anthr­yl)-1-(4-methoxy­phen­yl)spiro­[azetidin-3,9′-xanthen]-2-one. In the title isomer, the meth­oxy group is slightly twisted out of the plane of the attached benzene ring, with a C—O—C—C torsion angle of 31.5 (2)°. Its β-lactam ring is essentially planar, with a maximum deviation of −0.021 (1) Å. The β-lactam ring makes dihedral angles of 18.815 (9), 83.33 (7) and 53.62 (8)° with the mean planes of the benzene, xanthene and anthracene ring systems, respectively. The structure is stabilized by C—H⋯π, C—H⋯N and C—H⋯O inter­actions

4-(9-Anthr­yl)-1-(3-bromo­phen­yl)spiro­[azetidine-3,9′-xanthen]-2-one

In the title mol­ecule, C35H22BrNO2, the four-membered ring of the β-lactam unit is nearly planar [maximum deviation = 0.003 (3) Å] and makes dihedral angles of 87.07 (15), 59.80 (16) and 20.81 (19)°, respectively, with the xanthene system, the anthracene system and the bromo-substituted benzene ring. The mol­ecular conformation is stabilized by weak intra­molecular C—H⋯O and C—H⋯N hydrogen bonds. The crystal structure features weak C—H⋯π inter­actions

4-(9-Anthr­yl)-1-phenylspiro­[azetidine-3,9′-xanthen]-2-one

The β-lactam ring of the title compound, C35H23NO2, is nearly planar with a maximum deviation of 0.003 (3) Å from the mean plane. It makes dihedral angles of 17.4 (2), 85.22 (17) and 65.39 (16)°, respectively, with the phenyl, xanthene and anthracene ring systems. In the crystal structure, there are intra­molecular C—H⋯O and C—H⋯N contacts and mol­ecules are also linked by C—H⋯π inter­actions

4-(9-Anthr­yl)-1-(1-naphth­yl)spiro­[azetidine-3,9′-xanthen]-2-one n-hexane hemisolvate

In the title compound, C39H25NO2·0.5C6H14, the β-lactam ring is nearly planar [maximum deviation of 0.012 (2) Å from the mean plane] and makes dihedral angles of 36.41 (13), 88.87 (13) and 54.16 (12)°, respectively, with the naphthalene, xanthene and anthracene ring systems. The mol­ecular conformation is stabilized by intra­molecular C—H⋯O and C—H⋯N contacts. The complete solvent mol­ecule is generated by inversion. In the crystal structure, mol­ecules are linked to each other by C—H⋯π inter­actions

Crystal structure of 2-[4-(4-chlorophen-yl)-1-(4-methoxyphenyl)-2-oxoazetidin-3-yl]benzo[de]isoquinoline-1, 3-dione dimethyl sulfoxide monosolvate

Acknowledgements The authors are indebted to the X-ray laboratory of Dicle University Scientific and Technological Applied and Research Center, Diyarbakir, Turkey, for use of the X-ray diffractometer. AJ and JAR thank the Shiraz University Research Council for financial support (grant No. 93-GR–SC-23).Peer reviewedPublisher PD

4-(9-Anthr­yl)-1-(4-methoxy­phen­yl)spiro­[azetidin-3,9′-xanthen]-2-one

In the title mol­ecule, C36H25NO3, the β-lactam ring is essentially planar, with a dihedral angle of 3.3 (2)° between the two separate three-atom N/C/C planes. The β-lactam ring makes dihedral angles of 28.45 (14), 87.4 (1) and 51.8 (1)° with the mean planes of the benzene, xanthene and anthracene ring systems, respectively. In addition to a weak intra­molecular C—H⋯N hydrogen bond, the crystal structure is stabilized by two weak inter­molecular C—H⋯O hydrogen bonds