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2-Methyl-3-(n-octylsulfan-yl)quinoxaline.

ABSTRACT: All the non-H atoms of the title compound, C(17)H(24)N(2)S, lie almost in a common plane (r.m.s. deviation = 0.049?Å). The octyl chain adopts an all-trans conformation.

SUBMITTER: Ramli Y

PROVIDER: S-EPMC2983786 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Crystal structure of 2,3-bis-(4-methyl-phen-yl)benzo[g]quinoxaline.

Project description:The title compound, C26H20N2, was obtained during a search for new π-extended ligands with the potential to generate efficient phosphors with iridium(III) for organic light-emitting devices (OLEDs). The benzoquinoxaline ring system is almost planar (r.m.s. deviation = 0.076 Å). A pseudo-twofold rotation axis runs through the midpoints of the C2-C3 and C9-C10 bonds. The two phenyl rings are twisted relative to the benzoquinoxaline ring system, making dihedral angles of 53.91 (4) and 36.86 (6)°. In the crystal, C-H⋯π (arene) inter-actions link the mol-ecules, but no π-π inter-actions between aromatic rings are observed.

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3-(Ferrocen-1-ylcarbon-yl)-1-methyl-4-(4-methyl-phen-yl)spiro-[pyrrolidine-2,11'-indeno-[1,2-b]quinoxaline].

Project description:In the title compound, [Fe(C(5)H(5))(C(32)H(26)N(3)O)], the pyrrolidine ring adopts a twist conformation. The indeno-quinoxaline ring system [86.44?(5)°], the methyl-phenyl ring [86.06?(7)°] and the ferrocene rings [82.00?(7) and 83.95?(9)°] are almost perpendicular to the pyrrolidine ring. The two cyclopentadienyl rings adopt an eclipsed conformation. The crystal structure features C-H?N inter-actions.

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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)°].

| S-EPMC2979498 | biostudies-literature

2-Isopropyl-3-methyl-quinoxaline 1,4-dioxide.

Project description:In the title compound, C(12)H(14)N(2)O(2), the quinoxaline ring system and the C atoms of the methylene and methyl substituents lie on a mirror plane. The crystal packing is stabilized by weak ?-? inter-actions [centroid-centroid distance = 3.680?(7)?Å].

| S-EPMC3007200 | biostudies-literature

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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3'-Ferrocenylcarbon-yl-1'-methyl-4'-phenyl-spiro-[indeno-[2,3-b]quinoxaline-11,2'-pyrrolidine].

Project description:In the title compound, [Fe(C(5)H(5))(C(31)H(24)N(3)O)], the pyrrolidine ring makes a dihedral angle of 86.3?(3)° with the mean plane [r.m.s deviation = 0.074?(2)?Å] of the indeno-quinoxaline ring system. The central pyrrolidine ring adopts a twist conformation and the two cyclopentadienyl rings adopt an eclipsed conformation. In the crystal, mol-ecules are linked by weak C-H?N and C-H?? inter-actions, propagating along the c and a axes, respectively.

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2-(2-Chloro-phen-yl)-3-(3,4-dimeth-oxy-phen-yl)quinoxaline.

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

Project description: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.

| S-EPMC3379358 | biostudies-other

2,2'-(Quinoxaline-2,3-di-yl)diphenol dimethyl-formamide solvate.

Project description:In the title compound, C(20)H(14)N(2)O(2)·C(3)H(7)NO, the quinoxaline ring forms dihedral angles of 64.9 (2) and 30.9 (2)° with the two substituted benzene rings, which are themselves inclined at 58.4 (2)°. An intra-molecular O-H⋯N hydrogen bond occurs. In the crystal, mol-ecules are linked through inter-molecular O-H⋯O hydrogen bonds.

| S-EPMC2979914 | biostudies-literature

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