Mostrando 921 - 940 Resultados de 4,819 Para Buscar 'Pirimidina~', tiempo de consulta: 4.56s Limitar resultados
  1. 921
    “…In the title compound, [CdCl(2)(C(5)H(7)N(3)O)(2)], the Cd(II) atom is six-coordinated by two heterocyclic N atoms [Cd—N = 2.261 (2) and 2.286 (2) Å] and two O atoms [Cd—O = 2.624 (2) and 2.692 (2) Å] from two bidentate chelate 2-amino-6-methyl­pyrimidin-4(1H)-one ligands and two chloride ions [Cd—Cl = 2.4674 (6) and 2.4893 (7) Å]. …”
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  2. 922
    “…In the title co-crystal C(6)H(9)N(3)O(2)·C(10)H(9)NO(2), the 4,6-dimeth­oxy­pyrimidin-2-amine mol­ecule inter­acts with the carboxyl group of the 2-(1H-indol-3-yl)acetic acid mol­ecule through N—H⋯O and O—H⋯N hydrogen bonds, forming a cyclic hydrogen-bonded R (2) (2)(8) motif, which is further linked by an N—H⋯N hydrogen bond, forming a supra­molecular chain along the c axis. …”
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  3. 923
    “…The structure is iso­morphous with that of one of the polymorphs of 4,4,6-tri­methyl-1-phenyl-3,4-dihydro­pyrimidine-2(1H)-thione [Yam­in et al. (2005 ▶). Acta Cryst. …”
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  4. 924
    “…The distorted octa­hedral geometry of the metal atom is completed by an N-donor atom of the N-ethyl­pyrimidin-2-amine ligand: an intra­molecular N—H⋯O hydrogen links its N—H group to an acetate carboxyl­ate O atom. …”
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  5. 925
  6. 926
    por Zhu, Hai-Bin, Hou, Xian-Shan
    Publicado 2010
    “…In the title compound, [Pd(C(9)H(6)N(3)O(3)S)Cl], the Pd(II) ion is coordinated by one O and two N atoms from a 4-(pyridin-2-yl)pyrimidine-2-sulfonate ligand and one chloride anion in a distorted square-planar geometry. …”
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  7. 927
    por Zhu, Hai-Bin
    Publicado 2010
    “…In the macrocyclic centrosymmetric dinuclear complex, [Ag(2)(C(19)H(14)N(6)S(2))(2)](ClO(4))(2), the Ag(I) atom, bis­{[4-(2-pyrid­yl)pyrimidin-2-yl]sulfan­yl}methane (2-bppt) ligand and perchlorate anion each lie on a twofold rotation axis. …”
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  8. 928
  9. 929
    “…In the title compound, C(13)H(15)ClN(2)S, the dihydro­pyrimidine ring is essentially planar, with a maximum deviation from the least-squares plane of 0.122 (3) Å for the unsubstitued olefinic C atom. …”
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  10. 930
    “…The title compound, C(19)H(16)N(4), is one of the few known 3,7-diaryl-1,2,4-triazolo[4,3-c]pyrimidines. The triazolopyrimidine unit is essentially planar (r.m.s. deviation = 0.048 Å). …”
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  11. 931
    “…The benzothiene and pyrimidine rings are almost coplanar with an angular tilt of 2.371 (9)° between them. …”
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  12. 932
    “…The benzene ring is almost perpendicular to the dihydro­pyrimidine ring, with a dihedral angle of 83.97 (14)°. …”
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  13. 933
    por Yang, Wen-Na
    Publicado 2011
    “…The Co(II) atom, in an octa­hedral enviroment, is coordinated by four N atoms from two 2-methyl­sulfanyl-4-(pyridin-2-yl)pyrimidine ligands and two Cl atoms.…”
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  14. 934
    por He, Yan, Cui, Liang-Yan, Zhang, Xin-Ying
    Publicado 2011
    “…The aldehyde group is in the same plane as the pyrimidine ring [with a maximum deviation of 0.083 (2) Å for the O atom), and the linear propargyl group [C—C—C = 178.99 (19)°] makes a dihedral angle of 74.36 (13)° with the ring.…”
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  15. 935
    por Natarajan, Sampath, Mathews, Rita
    Publicado 2011
    “…One of them is formed between the pyrimidine ring (donor) and the carboxylate group (acceptor) from the benzoate, whereas the other ring is formed by N—H⋯O interactions, which help to form a dimer between two symmetry-related salts in the unit cell. …”
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  16. 936
    “…In the title compound, C(19)H(17)N(3)O(2), the dihedral angles between the pyrimidine ring and the two benzene rings are 34.87 (12) (for the directly-bonded ring) and 69.57 (12)°. …”
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  17. 937
  18. 938
    por Smith, Graham, Wermuth, Urs D.
    Publicado 2012
    “…In the asymmetric unit of the title co-crystal, C(7)H(5)NO(4)·C(12)H(14)N(4)O(2)S, there are two independent but conformationally similar heterodimers, which are formed through inter­molecular N—H⋯O(carb­oxy) and carbox­yl–pyrimidine O—H⋯N hydrogen-bond pairs, giving a cyclic motif [graph set R (2) (2)(8)]. …”
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  19. 939
  20. 940
    por Smith, Graham, Wermuth, Urs D.
    Publicado 2013
    “…In the asymmetric unit of the title co-crystal, C(12)H(14)N(4)O(2)S·C(7)H(5)NO(4), the sulfamethazine and 2-nitro­benzoic acid mol­ecules form a heterodimer through inter­molecular amide–carb­oxy­lic acid N—H⋯O and carb­oxy­lic acid–pyrimidine O—H⋯N hydrogen-bond pairs, giving a cyclic motif [graph set R (2) (2)(8)]. …”
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