In the title compound, C(13)H(9)ClN(2)O(5)S, the dihedral angle between the two rings is 71.2 (1)°. The crystal structure features inversion dimers linked by pairs of N-H⋯O(S) hydrogen bonds.

In the title compound, C(18)H(14)ClNO, the quinoline ring system is approximately planar with a maximum devation of 0.022 (1) Å and forms a dihedral angle of 62.70 (3)° with the phenyl ring. In the crystal, pairs of C-H⋯O inter-molecular hydrogen bonds link neighbouring mol-ecules into inversion dimers, forming R(2) (2)(14) ring motifs. These inversion dimers are stacked along the b axis. The s...

The microwave spectrum of y-thiobutyrolactone has been reinvestigated using microwave Fourier transform spectroscopy. The /ic rotation inversion transitions have been found to be splitted for the first excited state of the vibration at ~ 250 c m 1 . An inversion splitting of 0.014 MHz has been measured directly from these transitions. These splittings indicate that the vibration is related to a...

the 1h and natural-abundance 13c-nmr spectra of 1-thiacyclooctan-3-one (1) have been measured from 25 to -100°c. coalescence is observed in the 1h-nmr spectra of (1) at about -80°c, and attributed to ring inversion in a boat-chair conformation, which is the predominant conformation of (1). the free energy of activation (dg¹) for this process is 9.2±0.2 kcal/mol. the 13c-nmr spectra of (1) is te...

Although the title mol-ecule, C(20)H(16)N(2)O(10), does not possess mol-ecular inversion symmetry, it lies on a crystallographic inversion centre which imposes disorder on the central cyclo-hexene ring. In addition, the cyclo-hexene ring has non-symmetry-related disorder over two sites, with the ratio of the major and minor components being 0.54:0.46. The overall effect is to produce four disor...

The whole mol-ecule of the title compound, C32H34N2O2, is generated by inversion symmetry; the central benzene ring being situated about the crystallographic inversion center. The aromatic ring of the julolidine moiety is inclined to the central benzene ring by 33.70 (12)°. There are two intra-molecular O-H⋯N hydrogen bonds in the mol-ecule, generating S(6) ring motifs. The conformation about t...

In the title compound, [Ag(C12H8N2S)2]BF4, the two-coordinate Ag(I) ion lies on a crystallographic inversion center and is linearly bonded to the N-donor atoms of two separate quinoxaline ligands. The thio-phenyl ring of the ligand is nearly coplanar with the quinoxaline ring system [dihedral angle = 9.15 (13)°]. In the crystal, the complex mol-ecules pack in layers parallel to (-102) and form ...

In the title compound, C(12)H(9)ClN(2)O(4)S, the dihedral angle between the aromatic rings is 70.27 (8)°. In the crystal, mol-ecules are linked by pairs of N-H⋯O(S) hydrogen bonds, forming inversion dimers.

In the title mol-ecule, C18H18O4, the dihedral angle between the benzene rings is 52.52 (7)°. The C=C bond of the central enone group adopts a trans conformation. The relative conformation of the two double bonds in the enone group is s-transoid. In the crystal, mol-ecules are linked by pairs of weak C-H⋯O hydrogen bonds, forming inversion dimers.