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Phenyl quinoxalin-2-yl ether.

ABSTRACT: The aromatic ring systems in the title compound, C(14)H(10)N(2)O, form a dihedral angle of 63.8?(1)°, resulting in an opening up of the ether-O atom angle to 118.2?(1)°.

SUBMITTER: Hassan ND

PROVIDER: S-EPMC2960479 | biostudies-literature | 2008 Aug

REPOSITORIES: biostudies-literature

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Phenyl quinoxalin-2-yl ether.

Hassan Nor Duha ND Tajuddin Hairul Anuar HA Abdullah Zanariah Z Ng Seik Weng SW

Acta crystallographica. Section E, Structure reports online 20080823 Pt 9

The aromatic ring systems in the title compound, C(14)H(10)N(2)O, form a dihedral angle of 63.8 (1)°, resulting in an opening up of the ether-O atom angle to 118.2 (1)°. ...[more]

PMID: 21201795

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A second monoclinic modification of phenyl quinoxalin-2-yl ether.

Project description:The two aromatic systems in the title compound, C(14)H(10)N(2)O, enclose a dihedral angle of 77.9?(1)°, and the C-O-C inter-ring bond angle is 117.6?(1)°.

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Quinoxalin-2-yl o-tolyl ether.

Project description:The dihedral angle between the two aromatic ring systems in the title compound, C(15)H(12)N(2)O, is 85.9?(1)°; The angle at the O atom is widened to 118.2?(2)°. The quinoxalin-yloxy part of the mol-ecule lies on a mirror plane and the tolyl group is disordered over two positions about the mirror plane.

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Quinoxalin-2-yl m-tolyl ether.

Project description:The dihedral angle between the two aromatic ring systems in the title compound, C(15)H(12)N(2)O, is 79.4?(1)°. The angle at the O atom is widened to 116.93?(9)°.

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Project description:The dihedral angle between the two aromatic ring systems in the title compound, C(15)H(12)N(2)O, is 42.6?(1)°. The angle at the O atom is widened to 117.7?(1)°.

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Project description:In the crystal structure of the title compound, C(18)H(12)N(2)O, the two fused rings are aligned at 64.2?(1)°; the C-O-C angle is 118.73?(12)°.

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1-Naphthyl quinoxalin-2-yl ether.

Project description:In the crystal structure of the title compound, C(18)H(12)N(2)O, the dihedral angle between the two fused-ring systems is 84.3?(1) °; the C-O-C angle at the ether O atom is 117.31?(18)°.

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N'-(3-Methyl-quinoxalin-2-yl)-N'-phenyl-benzohydrazide.

Project description:In the crystal structure of the title compound, C(22)H(18)N(4)O, the quinoxaline system makes dihedral angles of 86.59?(7) and 63.37?(9)° with the benzohydrazide and phenyl rings, respectively. The benzohydrazide ring makes a dihedral angle of 72.46?(10)° with the phenyl ring. The crystal structure is stabilized by inter-molecular N-H?O hydrogen bonds, C-H?O contacts and C-H?? inter-actions.

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Project description:The title compound, C(16)H(12)Cl(2)O(3), crystallizes with two independent mol-ecules in the asymmetric unit. The dihedral angles between the planes of the benzene rings in the two independent mol-ecules are 68.65?(2) and 68.47?(3)°. The short distance of 3.899?(5)?Å between the centroids of the benzene rings of neighbouring mol-ecules indicate ?-? inter-actions. The crystal structure is stabilized by a network of intermolecular C-H?O hydrogen bonds.

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rac-(2R,3S)-2-Phenyl-3-(3-phenyl-1,2,3,4-tetra-hydro-quinoxalin-2-yl)quinoxaline.

Project description:The title compound, C(28)H(22)N(4), is the unexpected by-product of the reaction of 2-hydroxy-acetophenone and 1,2-diamino-benzene under iodine catalysis, during which a carbon-carbon ?-bond between two quinoxaline units was formed. Although a fully oxidized title compound should sterically be possible, only one quinoxaline ring is fully oxidized while the second ring remains in the reduced form. As expected, the tetra-hydro-quinoxaline unit is not planar; it adopts a sofa conformation, whereby the atom joining the two heterocyclic systems lies out of the plane of the other atoms. The quinoxaline ring system makes a dihedral angle of 53.61?(4)° with its phenyl ring substituent. The crystal packing is determined by pairs of N-H?N, N-H?? and weak C-H?N hydrogen bonds, forming a chain parallel to the a axis.

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