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In the title compound, C11H16N2O, the dihedral angle between the mean plane of the 4-methypyridine group and the plane of the amide link is 16.7 (1)°, and there is a short intra­molecular C—H...O contact. Hydrogen bonding (N—H...O) between amide groups forms chains parallel to the b axis. Pairs of methyl­pyridine groups from mol­ecules in adjacent chains are parallel but there is minimal π–π inter­action.

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In the title compound, C20H21N3O2·H2O (EQR·H2O), the quinazoline ring system forms dihedral angles of 53.1 (1) and 85.6 (1)° with the phenyl ring and the amide link, respectively. In the crystal, O—H...O hydrogen bonds link two EQR and two water mol­ecules into a centrosymmetric R44(18) ring motif. N—H...O hydrogen bonds further link these hydrogen-bonded fragments into columns extending in [010].

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In the title compound, C9H10BrClN2S, the di­methyl­thio­urea group is twisted from the benzene ring plane by 54.38 (6)°. In the crystal, the amino groups are involved in the formation of N—H...S hydrogen bonds, which link the mol­ecules into chains along [010]. Weak C—H...Cl inter­actions further link these chains into layers parallel to the ab plane.

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In the title compound, C15H12N2S, the methylthioquinazoline group is planar with the methyl C displaced by only 0.116 (3) Å from the plane of the quinazoline moiety. The dihedral angle between the phenyl ring and the quinazoline ring system is 13.95 (5)°. In the crystal, each molecule is linked by π–π stacking between to two adjacent inversion-related molecules. On one side, the inverted quinazoline groups interact with a centroid–centroid distance of 3.7105 (9) Å. On the other side, the quinazoline group interacts with the pyrimidine and phenyl rings of the second neighbour with centroid–centroid distances of 3.5287 (8) and 3.8601 (9) Å, respectively.

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The title compound, C10H12N2S, does not contain any strong hydrogen-bond donors but two long C—H...N contacts are observed in the crystal structure, with the most linear inter­action linking mol­ecules along [010]. The ellipsoids of the tert-butyl group indicate large librational motion.

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In the title compound, C10H10N2S, all non-H atoms are almost coplanar [maximum deviation = 0.103 (1) Å]. In the crystal, N—H...S inter­actions form R22(8) rings linking pairs of mol­ecules related by inversion. The mol­ecular pairs are stacked along [100]. A herringbone arrangement of pairs in the [010] direction forms layers parallel to (010).

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In the title compound, C17H27N3OS2, the amide group is approximately coplanar with the pyridine ring [dihedral angle = 1.6 (1)°], whereas the di­thio­carbamate group is nearly perpendicular to the pyridine ring [dihedral angle = 76.7 (1)°]. In the crystal, pairs of weak C—H...O hydrogen bonds link the mol­ecules into inversion dimers.

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In the title compound, C22H28N2, the dihedral angle between the planes of the phenyl ring and the di­hydro­quinazoline ring system (r.m.s. deviation = 0.030 Å) is 24.95 (7)° and both n-butane chains assume all-trans conformations. In the crystal, N—H...N hydrogen bonds link the mol­ecules into C(4) chains propagating in the [001] direction.

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In the mol­ecule of the title compound, C17H16N2OS, the almost planar methyl­sulfanylquinazoline group [the methyl C atom deviates by 0.032 (2) Å from the plane through the ring system] forms an inter­planar angle of 76.26 (4)° with the plane of the phenyl group. An intra­molecular O—H...N hydrogen bond is present between the quinazoline and hy­droxy groups. In the crystal, mol­ecules are stacked along the b-axis direction.
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