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2-(4-Fluoro-phen-yl)quinoxaline.

ABSTRACT: In the title compound, C(14)H(9)FN(2), the dihedral angle between the benzene ring and the quinoxaline ring system is 22.2?(3)°. Any aromatic ?-? stacking in the crystal must be very weak, with a minimum centroid-centroid separation of 3.995?(2)?Å.

SUBMITTER: Wang CP

PROVIDER: S-EPMC3379358 | biostudies-other | 2012 Jun

REPOSITORIES: biostudies-other

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2-(4-Fluoro-phen-yl)quinoxaline.

Wang Cui-Ping CP Ma Saiyong S Yu Jiang-Long JL Yan Jing-Bo JB Zhang Zhi-Qiang ZQ

Acta crystallographica. Section E, Structure reports online 20120519 Pt 6

In the title compound, C(14)H(9)FN(2), the dihedral angle between the benzene ring and the quinoxaline ring system is 22.2 (3)°. Any aromatic π-π stacking in the crystal must be very weak, with a minimum centroid-centroid separation of 3.995 (2) Å. ...[more]

PMID: 22719556

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3-(4-Fluoro-phen-yl)-6-meth-oxy-2-(4-pyrid-yl)quinoxaline.

Project description:In the title compound, C(20)H(14)FN(3)O, the quinoxaline system makes dihedral angles of 32.38?(7) and 48.04?(7)° with the 4-fluoro-phenyl and pyridine rings, respectively. The 4-fluoro-phenyl ring makes a dihedral angle of 57.77?(9)° with the pyridine ring. In the crystal, the mol-ecules form dimeric C-H?N hydrogen-bonded R(2) (2)(20) ring motifs lying about crystallographic inversion centers. The dimeric units stack via ?-? inter-actions between methoxy-phenyl rings and pyridine-fluoro-phenyl rings with centroid-centroid distances of 3.720?(1) and 3.823?(1)?Å, respectively. The respective average perpendicular distances are 3.421 and 3.378?Å, with dihedral angles between the rings of 1.31?(9) and 11.64?(9)°.

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2-(4-Bromo-phen-yl)quinoxaline.

Project description:In the title compound, C(14)H(9)BrN(2), the benzene and quinoxaline rings are almost coplanar [r.m.s. deviation = 0.0285?(3)?Å and dihedral angle = 2.1?(2)°].

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Project description:The title compound, C(22)H(17)ClN(2)O(2), was synthesized by the condensation reaction between 1,2-phenyl-enediamine and 2-chloro-3',4'-dimeth-oxy-benzil in boiling acetic acid. The chloro-phenyl and dimeth-oxy-phenyl rings make dihedral angles of 78.45 (5) and 35.60 (4)°, respectively, with the quinoxaline unit.

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2,3-Bis(4-ethoxy-phen-yl)quinoxaline.

Project description:The title compound, C(24)H(22)N(2)O(2), was prepared by condensation of 1,2-bis-(4-ethoxy-phen-yl)ethane-1,2-dione and 1,2-diamino-benzene. The asymmetric unit contains one half-mol-ecule, close to a twofold axis. The plane of the quinoxaline ring is twisted with respect to the planes of the two ethoxy-phenyl ring systems, exhibiting dihedral angles of 39.95?(9)°. The crystal packing is dominated by weak C-H?? inter-actions. No classical hydrogen bonds or stacking inter-actions are observed.

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2,3-Bis(4-bromo-phen-yl)quinoxaline.

Project description:The title compound, C(20)H(12)Br(2)N(2), was prepared by the reaction of 1-(3-bromo-phen-yl)-2-(4-bromo-phen-yl)ethane-1,2-dione with o-phenyl-enediamine in refluxing ethanol. In the mol-ecule, all bond lengths and angles are within normal ranges. The dihedral angle between the two benzene rings is 34.89?(1)°. The dihedral angles between the benzene rings and the quinoxaline system are 57.23?(1) and 36.75?(1)°. The crystal packing is stabilized by van der Waals forces.

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N-(2,3-Dimethyl-phen-yl)-4-fluoro-N-[(4-fluoro-phen-yl)sulfon-yl]benzene-sulfonamide.

Project description:In the title compound, C(20)H(17)F(2)NO(4)S(2), the dihedral angles between the o-xylene ring and the fluoro-benzene rings are 31.7?(1) and 32.8?(1)°, and the dihedral angle between the fluoro-benzene rings is 50.9?(1)°. The C-N-S-C torsion angles are 76.7?(2) and 101.8?(2)°. In the crystal, mol-ecules are connected by C-H?O inter-actions into sheets in the ab plane.

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5-(3,5-Di-fluoro-phen-yl)-1-(4-fluoro-phen-yl)-3-tri-fluoro-methyl-1H-pyrazole.

Project description:In the title compound, C16H8F6N2, the dihedral angle between the pyrazole and di-fluoro-benzene rings is 50.30?(13)°, while those between the pyrazole and fluoro-benzene rings and between the di-fluoro-benzene and fluoro-benzene rings are 38.56?(13) and 53.50?(11)°, respectively. Aromatic ?-? stacking inter-actions between adjacent di-fluoro-benzene rings [centroid-centroid separation = 3.6082?(11)?Å] link the mol-ecules into dimers parallel to [21-2].

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(3,4-Dimeth-oxy-phen-yl)(4-fluoro-phen-yl)methanone.

Project description:In the title compound, C(15)H(13)FO(3), the dihedral angle between the two aromatic rings is 52.78?(8)°. In the crystal, inter-molecular C-H?O hydrogen bonds link mol-ecules into chains running parallel to the c axis.

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2-Fluoro-5-(4-fluoro-phen-yl)pyridine.

Project description:In the title compound, C(11)H(7)F(2)N, the fluoro-benzene and the 2-fluoro-pyridine rings are oriented at a dihedral angle of 37.93 (5)°. In the crystal, only van der Waals inter-actions occur.

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Crystal structures of 3-fluoro-N-[2-(tri-fluoro-meth-yl)phen-yl]benzamide, 3-bromo-N-[2-(tri-fluoro-meth-yl)phen-yl]benzamide and 3-iodo-N-[2-(tri-fluoro-meth-yl)phen-yl]benzamide.

Project description:In the title compounds, C14H9F4NO, (I), C14H9BrF3NO, (II), and C14H9F3INO, (III), the two benzene rings are inclined to one another by 43.94 (8)° in mol-ecule A and 55.66 (7)° in mol-ecule B of compound (I), which crystallizes with two independent mol-ecules in the asymmetric unit, but by only 10.40 (12)° in compound (II) and 12.5 (2)° in compound (III). In the crystals of all three compounds, N-H⋯O hydrogen bonds link the mol-ecules to form chains propagating along the a-axis direction for (I), and along the b-axis direction for (II) and (III). In the crystal of (I), -A-B-A-B- chains are linked by C-H⋯O hydrogen bonds, forming layers parallel to (010). Within the layers there are weak offset π-π inter-actions present [inter-centroid distances = 3.868 (1) and 3.855 (1) Å]. In the crystals of (II) and (III), the chains are linked via short halogen-halogen contacts [Br⋯Br = 3.6141 (4) Å in (II) and I⋯I = 3.7797 (5) Å in (III)], resulting in the formation of ribbons propagating along the b-axis direction.

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