1,4-Bis(3-chloro­pyrazin-2-yl­oxy)benzene

In the title compound, C₁₄H₈Cl₂N₄O₂, the pyrazine rings are orthogonal to the benzene ring, making dihedral angles of 88.42 (8) and 89.22 (8)°. The Cl atoms attached to the pyrazine rings deviate by −0.0597 (5) and 0.0009 (5) Å from the ring plane. The crystal structure features C—H...N hydrogen bonds.

Methyl 3,5-bis­[(3-chloro­pyrazin-2-yl)­oxy]benzoate

In the title compound, C₁₆H₁₀Cl₂N₄O₄, the pyrazine rings make dihedral angles of 67.82 (9) and 75.91 (9)° with the benzene ring, while the dihedral angle between the pyrazine rings is 44.69 (10)°. The meth­oxy­carbonyl group makes a dihedral angle of 16.82 (8)° with the benzene ring to which it is attached. In the crystal, C—H...O hydrogen bonds link the mol­ecules, forming chains running along the ab plane.

8,15-Dioxa-10,13-di­aza­tetra­cyclo­[14.4.0.0^2,7.0^9,14]icosa-1(16),2,4,6,9(14),10,12,17,19-nona­ene

The asymmetric unit of the title compound, C₁₆H₁₀N₂O₂, contains one half-mol­ecule, the complete mol­ecule being generated by twofold rotation symmetry. The plane of the pyrazine ring forms a dihedral angle of 64.87 (6)° with that of the benzene ring, and the planes of the two benzene rings are inclined to one another by 54.20 (6)°. The O atom deviates from the plane of the benzene ring by 0.1549 (8) Å. There are no significant inter­molecular inter­actions in the crystal.

1,3-Bis[(3-chloro­pyrazin-2-yl)­oxy]benzene

The asymmetric unit of the title compound, C₁₄H₈Cl₂N₄O₂, contains one half-mol­ecule, the complete mol­ecule being generated by the operation of a twofold rotation axis. The Cl atom deviates significantly from the plane of the pyrazine ring [0.0215 (4) Å]. The central benzene ring makes a dihedral angle of 72.82 (7)° with the plane of the pyrazine ring.