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2-(4-Meth-oxy-phen-oxy)pyrazine.

ABSTRACT: In the title compound, C(11)H(10)N(2)O(2), the aromatic rings are almost orthogonal to each other [dihedral angle = 86.97 (8)°], with the benzene ring orientated to face one of the pyrazine N atoms. In the crystal, centrosymmetrically related pairs are connected via pairs of C-H⋯π inter-actions and the dimeric units thus formed pack into undulating layers that stack along the a axis.

SUBMITTER: Nasir SB

PROVIDER: S-EPMC3007882 | biostudies-literature | 2010 Aug

REPOSITORIES: biostudies-literature

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2-(4-Meth-oxy-phen-oxy)pyrazine.

Nasir Shah Bakhtiar SB Abdullah Zanariah Z Mainal Azizah A Fairuz Zainal A ZA Ng Seik Weng SW Tiekink Edward R T ER

Acta crystallographica. Section E, Structure reports online 20100818 Pt 9

In the title compound, C(11)H(10)N(2)O(2), the aromatic rings are almost orthogonal to each other [dihedral angle = 86.97 (8)°], with the benzene ring orientated to face one of the pyrazine N atoms. In the crystal, centrosymmetrically related pairs are connected via pairs of C-H⋯π inter-actions and the dimeric units thus formed pack into undulating layers that stack along the a axis. ...[more]

PMID: 21588653

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2-(2-Meth-oxy-phen-oxy)pyrazine.

Project description:A significant twist is observed in the title molecule, C(11)H(10)N(2)O(2), as seen in the dihedral angle between the pyrazine and benzene rings of 72.79?(8)°. The meth-oxy group is almost coplanar with the benzene ring to which it is attached [C-O-C-C torsion angle = 175.83?(15)°]. Centrosymmetric dimers are formed in the crystal structure which are held together by weak ?-? inter-actions between pyrazine rings [centroid-centroid distance = 3.8534?(10)?Å].

| S-EPMC3247475 | biostudies-literature

3-(4-Meth-oxy-phen-yl)pyrido[2,3-b]pyrazine.

Project description:In the title mol-ecule, C(14)H(11)N(3)O, the benzene ring is twisted by 14.0 (2)° from the plane through the fused ring system. In the crystal, π-π inter-actions [centroid-centroid distances = 3.609 (1), 3.639 (1) and 3.735 (1) Å] form stacks of mol-ecules propagating along the b axis. The crystal packing is further stabilized by weak inter-molecular C-H⋯O and C-H⋯N hydrogen bonds.

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N-(2-Phen-oxy-phen-yl)pyrazine-2-carboxamide.

Project description:In the title compound, C(17)H(13)N(3)O(2), the pyrazine ring is oriented at 1.65 (11) and 88.33 (17)° with respect to the benzene rings. The benzene rings are nearly perpendicular to each other [dihedral angle 87.14 (17)°]. In the crystal, a weak C-H⋯N hydrogen bond occurs.

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2-(2-Meth-oxy-phen-oxy)-3-nitro-pyridine.

Project description:In the title compound, C(12)H(10)N(2)O(4), the pyridine and benzene rings are almost orthogonal, forming a dihedral angle of 86.63?(6)°. Each of the nitro [O-N-C-C torsion angle = -6.45?(19)°] and meth-oxy [C-O-C-C torsion angle = 179.69?(11)°] groups is almost coplanar with the ring to which it is connected. Mol-ecules are consolidated in the crystal structure via C-H?O inter-actions, forming a three-dimensional network.

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(E)-1-[2-Hy-droxy-4,6-bis-(meth-oxy-meth-oxy)phen-yl]-3-[3-meth-oxy-4-(meth-oxy-meth-oxy)phen-yl]prop-2-en-1-one.

Project description:The title compound, C(22)H(26)O(9), crystallizes with two independent mol-ecules in the asymmetric unit in which the dihedral angles between the two benzene rings are 21.4 (2) and 5.1 (2)°. An intra-molecular O-H⋯O hydrogen bond occurs in each mol-ecule. Inter-molecular C-H⋯O hydrogen bonds stabilize the crystal structure.

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3-(4-Hy-droxy-3-meth-oxy-phen-yl)acrylic acid-2,3,5,6-tetra-methyl-pyrazine (2/1).

Project description:The asymmetric unit of the title compound, C(8)H(12)N(2)·2C(10)H(10)O(4), contains a tetra-methyl-pyrazine mol-ecule, situated about an inversion center, and two substituted acrylic acid derivatives. The dihedral angle between the phenyl and pyrazine rings is 69.45 (9)°. In the crystal, inter-molecular O-H⋯O, O-H⋯N hydrogen bonds and weak C-H⋯O inter-actions lead to the formation of a supra-molecular network. The acrylic acid side chain is positionally disordered [occupancy ratio 0.852 (7):0.148 (7)].

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2-(3-Meth-oxy-phen-oxy)pyrimidine.

Project description:In the title compound, C(11)H(10)N(2)O(2), the benzene ring faces towards one of the pyrimidine N atoms, and is almost orthogonal to the plane through the pyrimidine ring [dihedral angle = 84.40 (14)°]. In the crystal, the presence of C-H⋯π and π-π [centroid-centroid separation = 3.7658 (18) Å] inter-actions leads to a supra-molecular array in the ac plane. The layers thus formed inter-digitate along the b axis.

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2-(4-Meth-oxy-phen-oxy)acetohydrazide.

Project description:The title compound, C(9)H(12)N(2)O(3), was synthesized by the reaction of ethyl 2-(4-meth-oxy-phen-oxy)acetate with hydrazine hydrate in ethanol. In the acetohydrazide group, the N-N bond is relatively short [1.413 (2) Å], suggesting some degree of electronic delocalization in the mol-ecule. In the crystal, mol-ecules are linked into sheets lying parallel to the ab plane by N-H⋯N and N-H⋯O hydrogen bonds.

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2-Meth-oxy-imino-2-{2-[(2-methyl-phen-oxy)meth-yl]phen-yl}ethanol.

Project description:In the title compound, C(17)H(19)NO(3), the dihedral angle between the benzene rings is 68.0 (1)°. The C-O-C-C torsion angle of the atoms joining these rings is 179.7 (2)°. The atoms of the methanol group were refined as disordered over two sets of sites with fixed occupancies of 0.86 and 0.14. The H atoms of the hy-droxy group in the major component are disordered over a further two sets of sites with equal occupancies. This is a necessary arrangement to allow for hydrogen bonding without unrealistic H⋯H contacts. In the crystal, O-H⋯N and O-H⋯O hydrogen bonds connect mol-ecules into chains along [001].

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4-{2-Meth-oxy-6-[(4-methyl-phen-yl)imino-meth-yl]phen-oxy}phthalonitrile.

Project description:In the mol-ecule of the title compound, C(23)H(17)N(3)O(2), the methoxy-phenyl ring is oriented at dihedral angles of 13.34 (12) and 88.83 (12)° with respect to the methyl-phenyl and phthalonitrile rings, respectively; the dihedral angle between methyl-phenyl and phthalonitrile rings is 89.67 (10)°. In the crystal structure, weak inter-molecular C-H⋯N inter-actions link mol-ecules into chains. A weak C-H⋯π inter-action is also found..

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