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In the title compound, C15H13N3O, the pyrrolyl and phenyl rings make dihedral angles of 58.99 (5) and 34.95 (5)°, respectively, with the central pyrazole ring. In the crystal, weak, pairwise C—H...O inter­actions across centers of symmetry form dimers, which are further associated into corrugated sheets running approximately parallel to (100) via weak C—H...N inter­actions.

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In the title compound, C15H15N7, the phenyl ring is inclined by 19.86 (5)° to the mean plane of the pyrazolo­[3,4-b]pyrazine core. In the crystal, N—H...N and C—H...N hydrogen bonds form [010] chains, which stack via π–π inter­actions [centroid–centroid distance between the pyrazole rings = 3.4322 (7) Å].

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The title compound, C16H16N4O2, crystallizes with two mol­ecules in the asymmetric unit, one of which shows disorder of the acetate group over two sets of sites in a 0.799 (2):0.201 (2) ratio. The phenyl group has a similar but opposite sense of twist relative to the pyrazole ring in the two mol­ecules, as indicated by the syn N—N—Car—Car (ar = aromatic) torsion angles of 39.7 (2) and −36.9 (2)°. Each mol­ecule features an intra­molecular N—H...O hydrogen bond, which closes an S(6) ring. In the crystal, C—H...O and C—H...N inter­actions direct the packing into a layered structure parallel to (110).

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The title compound, C15H14N4O, crystallizes with two mol­ecules in the asymmetric unit with similar conformations (r.m.s. overlay fit for the 20 non-H atoms = 0.175 Å). In the first mol­ecule, the dihedral angles between the planes of the central pyrazole ring and the pendant phenyl and pyrrole rings are 42.69 (8) and 51.88 (6)°, respectively, with corresponding angles of 54.49 (7) and 49.61 (9)°, respectively, in the second mol­ecule. In the crystal, the two mol­ecules, together with their inversion-symmetry counterparts, are linked into tetra­mers by O—H...N hydrogen bonds. The tetra­mers form layers parallel to (211) through pairwise C—H...π inter­actions.
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