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The pyrimidine ring of the title compound, C25H30N2O3, is approximately planar (r.m.s. deviation = 0.003 Å); the C atom at the 5-position deviates by 0.012 (3) Å from the mean plane and the C atom at the 6-position by 0.038 (3) Å. In the mol­ecule, the pyrimidine ring is oriented at 86.72 (9) and 59.75 (9)° with respect to the two benzene rings, and the two benzene rings are inclined to each other at 58.35 (9)°. In the crystal, the amino group is hydrogen-bond donor to the exocyclic O atom at the 4-position of an adjacent mol­ecule, the hydrogen bond generating an inversion dimer.

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The 1,2,4-triazine ring of the title compound, C8H13N3O3, is nearly planar (r.m.s. deviation = 0.019 Å). The imino group is hydrogen-bond donor to the exocyclic O atom at the 5-position of an adjacent mol­ecule, the N—H...O hydrogen bond generating a chain parallel to the b axis.

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The pyrimidine ring in the title compound, C19H24N2O3, is nearly planar (r.m.s. deviation = 0.008 Å); the C atom at the 5-position deviates by 0.054 (3) Å from the mean plane and the C atom at the 6-position by 0.006 (3) Å in the opposite direction. The benzene ring is approximately perpendicular to the pyrimidine ring [dihedral angle = 83.90 (10)°]. The amino group is hydrogen-bond donor to the exocyclic O atom at the 2-position of an adjacent mol­ecule, the hydrogen bond generating an inversion dimer. The cyclo­propyl ring is disordered over two sets of sites with the major component having 71.5 (4)% occupancy.

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The asymmetric unit of the compound, C20H26N2O5·0.5C2H5OH, consists of two tetra­hydro­pyrimidine-2,4-dione mol­ecules and an ethanol mol­ecule. The pyrimidine rings are nearly planar (r.m.s. deviation = 0.006 Å in one mol­ecule and 0.009 Å in the other); the C atom at the 5-position deviates by 0.083 (3) Å [0.064 (3) Å in the second mol­ecule] from the mean plane and the C atom at the 6-position by 0.034 (3) Å [0.082 (3) Å in the second mol­ecule]. In each mol­ecule, the benzene ring is nearly perpendicular to the pyrimidine ring, the dihedral angle is 88.51 (8)° in one mol­ecule and 84.70 (8)° in the other. The amino group of each tetra­hydro­pyrimidine-2,4-dione mol­ecule is a hydrogen-bond donor to the exocyclic O atom at the 2-position of an adjacent mol­ecule, the hydrogen bond generating an inversion dimer in each case. The ethanol mol­ecule forms a hydrogen bond to the meth­oxy O atom of one of two independent mol­ecules.

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In the mol­ecule of the title compound, C14H16O3, all non-H atoms except for one methyl C atom lie on a crystallographic mirror plane. The conformation with respect to the C=C bond [1.3465 (12) Å] is trans. In the crystal, mol­ecules are linked via C—H...O hydrogen bonds into C(5) chains propagating along [100].

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The title thio­uracil derivative, C9H11N3OS, exists in the thione form. The six atoms comprising the ring are almost coplanar [r.m.s. deviation = 0.015 Å] and the 2-methyl­propyl group lies approximately perpendicular to this plane [the N—C—C—C torsion angle is 72.88 (14)°]. Linear supra­molecular chains along [001] sustained by N—H...O and N—H...S hydrogen bonding feature in the crystal packing.

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In the title compound, C12H17N3O2S, the 4-methyl-2-methyl­sulfanyl-6-oxo-1,6-dihydro­pyrimidine-5-carbonitrile part of the mol­ecule is almost planar (r.m.s deviation = 0.062 Å). In the crystal, mol­ecules form centrosymmetric dimers via pairs of N—H...O hydrogen bonds.

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In the title compound, C24H25N3S2, the S-bound benzene rings have orthogonal [dihedral angle = 85.31 (9)°] and splayed [67.92 (11)°] orientations with respect to the pyrimidine ring; the dihedral angle between the benzene rings is 48.18 (12)°. The pentyl group has an extended all-trans conformation and lies to one side of the pyrimidine ring [the Npy-Cpy-Cp-Cp torsion angle = -85.7 (2)°; py = pyrimidine and p = pent­yl].

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In the title compound, C22H20ClN3S2, the S-bound benzene rings are inclined [dihedral angles = 78.13 (10) and 36.70 (9)°] with respect to the pyrimidine ring. The methyl­propyl group occupies a position normal to the pyrimidine ring [N—C—C—C torsion angle = 92.3 (2)°]. In the crystal, supra­molecular layers are formed in the bc plane, being consolidated by C—H...π and π—π inter­actions, the latter between the pyrimidine and S-bound benzene rings [inter-centroid distance = 3.7683 (12) Å].

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Three independent mol­ecules comprise the asymmetric unit of the title compound, C23H20ClF3N4S. The conformations of the mol­ecules are similar with the chloro­benzene and CF3-benzene rings almost perpendicular to, and almost co-planar with, the pyrimidinyl ring [range of dihedral angles = 80.36 (13)–88.07 (14) and 11.89 (14)–23.30 (14)°, respectively]; the benzene rings are roughly orthogonal to each other [64.81 (16)–72.16 (15)°]. In the crystal, two of the independent mol­ecules associate via weak N—H...N(cyano) hydrogen bonds and 12-membered {...HNC3N}2 synthons; the third independent mol­ecule self-associates similarly but about a centre of inversion. The sample studied was found to be a non-merohedral twin and the minor twin component refined to 47.16 (7)%.
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