In the title compound, C18H15BrClNO2, the indole ring system forms a dihedral angle of 86.9 (2)° with the 3-chloro-benzyl ring. In the crystal, mol-ecules form inversion dimers connected via pairs of O-H⋯O hydrogen bonds.

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</s...

0.1 Group theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 0.2 Ring theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 0.3 Field theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 0.4 Arithmetic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 0.4.1 Residue classes modulo n . . . . . . . . . . . . . . . . . . 6 0.4.2 The ring ...

The complete mol-ecule of the title compound, C(20)H(18)N(4)O(2)S(2), is generated by crystallographic inversion symmetry. The benzene ring is almost coplanar with the oxadiazole ring [dihedral angle = 7.2 (2)°].

INTRODUCTION Uterine inversion is a rare obstetric emergency that can lead to hypovolemic shock or even maternal death. There are many management strategies, but they are poorly described and dispersed in the medical literature. The purpose of this article is to describe a case of complete acute uterine inversion and a review of the literature. CASE PRESENTATION The authors describe a case of...

0.1 Group theory . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 0.2 Ring theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 0.3 Field theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 0.4 Arithmetic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 0.4.1 Residue classes modulo n . . . . . . . . . . . . . . . . 8 0.4.2 The ring Z[X] . . . . . . . ....

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, molecul...

Among the descriptors of the molecular structure of carbohydrates, the conformation of the pyranose ring is usually the most problematic one to tackle. We present the results of a systematic study oriented at determining the ring-inversion properties of all d-hexopyranoses in the form of monosaccharides, O1-methylated monosaccharides and homotrisaccharides. Contrary to the existing studies, bas...

The mol-ecule of the title compound, C(28)H(42)N(6), has site symmetry with the centroid of the piperazine ring located on an inversion center. The piperazine ring adopts a chair conformation. The benzene ring and propyl-piperazine are on opposite sides of the C=N bond, showing an E configuration.

In the title compound, C(10)H(6)ClF(3)N(4)O(3), the dihedral angle between the benzene ring and the triazolone ring is 59.9 (1)°, while the nitro substituent subtends an angle of 39.5 (1)° to the benzene ring plane. In the crystal, pairs of mol-ecules form inversion dimers via C-H⋯O hydrogen bonds.