نتایج جستجو برای: ring inversion
تعداد نتایج: 164449 فیلتر نتایج به سال:
In the title compound, C22H24O3S, the cyclo-hexyl ring adopts a chair conformation. The dihedral angle between the mean plane [r.m.s. deviation = 0.010 (1) Å] of the benzo-furan ring system and the benzene ring is 81.78 (4)°. In the crystal, mol-ecules are linked via pairs of C-H⋯π inter-actions into inversion dimers. These dimers are further linked by C-H⋯π inter-actions into supra-molecular c...
The mol-ecule of the title compound, C(8)H(8)BrClO(2), sits on a crystallographic inversion centre, which ensures that the halogen sites are disordered, with exactly 50% Br and 50% Cl at each halogen site. The inversion renders the two meth-oxy groups equivalent. These groups lie almost in the plane of the aromatic ring system, making dihedral angles of 8.8 (4)° to the ring.
In the title compound, C23H18BrN3OS·0.5H2O, the bromo-phenyl, phenyl and phenol rings make dihedral angles of 46.5 (1), 66.78 (8) and 15.4 (2)°, respectively, with the mean squares plane of the thia-zol-idene ring. In the crystal, the lattice water mol-ecule is hydrogen bonded to the phenol group and makes a weaker O-H⋯N connection to an inversion-related mol-ecule, forming a ring while weak pa...
In the title compound, C(24)H(20)BrN(3)O(4)S, the central benzene ring makes dihedral angles of 24.55 (8), 49.52 (12) and 59.65 (7)°, respectively, with the pyrazolone ring, the bromo-benzene ring and the terminal phenyl ring. The packing is stabilized by weak non-classical inter-molecular C-H⋯O=C hydrogen bonds that form inversion-related dimers.
In the title compound, C(19)H(24)N(2)O(3), the benzene ring forms a dihedral angle of 65.34 (7)° with the pyrazole ring. The cyclo-hexane ring adopts a chair conformation. In the crystal, mol-ecules are linked into a inversion dimers by pairs of C-H⋯O hydrogen bonds, generating R(2) (2)(22) ring motifs.
for the first time nakayama introduced qf-ring. in 1967 carl. faith and elbert a. walker showed that r is qf-ring if and only if each injective right r-module is projective if and only if each injective left r-modules is projective. in 1987 s.k.jain and s.r.lopez-permouth proved that every ring homomorphic images of r has the property that each cyclic s-module is essentialy embeddable in dire...
In the title compound, C26H16N6O, the dihedral angles between the central pyrrole ring and the pendant indole ring system (r.m.s. deviation = 0.027 Å) and the azide-bearing benzene ring are 37.56 (8) and 51.62 (11)°, respectively. The azide group is almost coplanar with its attached benzene ring [C-C-N-N = 3.8 (3)°]. The benzoyl benzene ring is disordered over two orientations twisted with resp...
The complete mol-ecule of the title compound, C(26)H(20)N(2), is generated by crystallographic inversion symmetry. The terminal phenyl ring is twisted by 19.2 (1)° with respect to the adjacent phenyl-ene ring.
The mol-ecule of the title compound, C(26)H(26)Br(4)O(6), is located around a crystallographic inversion center. The dihedral angle between the central benzene ring and the outer benzene ring is 89.26 (1)°.
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