نتایج جستجو برای: ring inversion

تعداد نتایج: 164449  

2014
Hong Dae Choi Pil Ja Seo Uk Lee

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...

2010
Yang Song Sean Parkin Hans-Joachim Lehmler

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.

2014
Joel T. Mague Mehmet Akkurt Shaaban K. Mohamed Alaa A. Hassan Mustafa R. Albayati

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...

Journal: :Proceedings of the London Mathematical Society 1873

2008
Mei Li Xin Chen

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.

2011
Hoong-Kun Fun Ching Kheng Quah B. Chandrakantha A. M. Isloor Prakash Shetty

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.

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز 1379

‏‎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...

2015
G. Vimala J. Kamal Raja Y. Amina Naaz P. T. Preumal A. SubbiahPandi

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...

2008
Wagee A. Yehye Azhar Ariffin Noorsaadah A. Rahman Seik Weng Ng

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.

2010
Ertan Şahin Halis T. Balaydın Süleyman Göksu Abdullah Menzek

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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