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Mostrando 601 - 620 Resultados de 4,819 Para Buscar 'Pirimidina~', tiempo de consulta: 4.85s Limitar resultados
  1. 601
    por Lehmler, Hans-Joachim, Parkin, Sean
    Publicado 2008
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    5-Fluoro-1-(3-metylbutano­yl)pyrimidine-2,4(1H,3H)-dione
  2. 602
    “…In the title compound, [Mn(2)(C(2)O(4))(C(5)H(3)N(2)O(2))(2)(H(2)O)(2)](n), the Mn(II) atom exhibits a distorted octa­hedral coordination geometry, with the centrosymmetric oxalate anion and the monoanionic pyrimidine-2-carboxyl­ate ligands generating a two-dimensional honeycomb network with a (6,3)-topology.…”
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    Poly[diaqua-μ(2)-oxalato-di-μ(2)-pyrimidine-2-carboxyl­ato-dimanganese(II)]
  3. 603
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    Low-temperature redetermination of 3,4,5,6-tetra­hydro­pyrimidin-2(1H)-one
  4. 604
    “…The asymmetric unit of the title compound, C(16)H(17)FN(2)O(4)S, contains three independent mol­ecules, in which the pyrimidine and benzene rings are oriented at dihedral angles of 41.72 (3)°, 26.21 (3)° and 36.49 (3)°. …”
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    Methyl 4-(4-fluoro­phen­yl)-6-isopropyl-2-(methylsulfonyl)pyrimidine-5-carbox­ylate
  5. 605
    “…In the title compound, C(15)H(15)N(5)O(4)S, the dihedral angle between the pyrimidine and benzene rings is 84.56 (2)°. Intra­molecular hydrazine–carbonyl N—H⋯O and inter­molecular sulfonamide–pyridimine N—H⋯N hydrogen bonds stabilize the mol­ecular and crystal structures, respectively.…”
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    4-[2-(1-Acetyl-2-oxopropyl­idene)­hydrazino]-N-(pyrimidin-2-yl)benzene­sulfonamide
  6. 606
    “…The title compound, C(12)H(15)N(3)OS, features an envelope conformation for the 1,3-thia­zolidin-4-one ring with the S atom as the flap atom. The pyrimidine ring is almost orthogonal to the 1,3-thia­zolidin-4-one ring as indicated by the N—C—C—N torsion angle of −111.96 (18)°. …”
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    4-(Pyrimidin-2-yl)-1-thia-4-aza­spiro­[4.5]decan-3-one
  7. 607
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    trans-Bis[4-amino-N-(pyrimidin-2-yl)benzene­sulfonamidato]dipyridine­nickel(II) hemihydrate
  8. 608
    por Dong, Hua-Ze, Zhu, Hai-Bin, Gou, Shao-Hua
    Publicado 2009
    “…Intra­molecular π–π inter­actions between the pyrimidine rings [centroid–centroid distance = 3.654 (2) Å] and between the pyridine rings [centroid–centroid distance = 3.775 (2) Å] help to set the mol­ecular conformation; the pyrimidine rings, as well as the pyridine rings, are nearly parallel, forming dihedral angles of 4.12 (14) and 2.46 (14)°, respectively.…”
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    cis-1,2-Bis{[4-(4-pyrid­yl)pyrimidin-2-yl]sulfanylmeth­yl}benzene
  9. 609
    “…In the title compound, C(14)H(14)ClN(3)OS, the 4,6-dimethyl­pyrimidine ring and the chloro­benzene ring subtend a dihedral angle of 80.0 (2)°. …”
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    N-(2-Chloro­phen­yl)-2-(4,6-dimethyl­pyrimidin-2-ylsulfan­yl)acetamide
  10. 610
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    trans-Bis[4-amino-N-(pyrimidin-2-yl)benzene­sulfonamidato]dipyridine­cobalt(II) hemihydrate
  11. 611
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    Bis[4-amino-N-(pyrimidin-2-yl)benzene­sulfonamidato](2,2′-bipyridine)manganese(II)
  12. 612
    “…The dihedral angles of the pyrimidine ring with the benzene and pyridyl rings are 22.3 (1) and 53.2 (9)°, respectively, in mol­ecule A, and 6.8 (1) and 11.6 (9)° in mol­ecule B. …”
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    N-(5-Amino-2-methyl­phen­yl)-4-(3-pyri­dyl)­pyrimidin-2-amine
  13. 613
    “…A new and facile synthesis of 2-thioxoquinazolin-4-ones by introducing a benzenoid system in the pyrimidine moiety by reacting ethoxymethylene derivatives of 1,3-diarylthiobarbituric acids (DTBA) with active methylene compounds, such as malononitrile and ethyl cyanoacetate, in presence of ZnCl(2) has been developed.…”
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    A new and facile synthetic approach to substituted 2-thioxoquinazolin-4-ones by the annulation of a pyrimidine derivative
  14. 614
    “…The mol­ecule of the title perimidine derivative, C(18)H(12)N(2)O(3), is essentially planar, the dihedral angle between the benzene and perimidine rings being 3.25 (5)°. …”
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    2-(2-Hy­droxy-3-meth­oxy­phen­yl)-6H-perimidin-6-one
  15. 615
    “…Self-assembly of these dimeric units results in a four-component supra­molecular unit featuring a homosynthon between two mol­ecules of the pyrimidin-2-amine involving two N—H⋯O hydrogen bonds, and two heterosynthons between each one mol­ecule of pyrimidin-2-amine and 1-phenyl­cyclo­pentane-1-carb­oxy­lic acid involving N—H⋯O and O—H⋯N hydrogen bonds.…”
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    Pyrimidin-2-amine–1-phenyl­cyclo­pentane-1-carb­oxy­lic acid (1/1)
  16. 616
    “…However little is known about repair of pyrimidine-derived hydantoins in human cells. METHODOLOGY/PRINCIPAL FINDINGS: Here, using both denaturing PAGE and MALDI-TOF MS analyses we report that the bacterial, yeast and human AP endonucleases can incise duplex DNA 5′ next to 5OH-Hyd and 5OH-5Me-Hyd thus initiating the NIR pathway. …”
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    New Insights in the Removal of the Hydantoins, Oxidation Product of Pyrimidines, via the Base Excision and Nucleotide Incision Repair Pathways
  17. 617
    “…The treatment with 5-FU can lead to severe toxicity due to enzyme deficiencies in the degradation of pyrimidines, but it can also lead to thiamine deficiency with the classic symptoms of beriberi. …”
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    Severe Encephalopathy, Lactic Acidosis, Vegetative Instability and Neuropathy with 5-Fluorouracil Treatment – Pyrimidine Degradation Defect or Beriberi?
  18. 618
    por Zhu, Hai-Bin, Lu, Xin
    Publicado 2011
    “…In L, the pyridine and pyrimidine rings are twisted at an angle of 11.2 (1)°. …”
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    Tetra­aqua­bis­{2-[4-(4-pyrid­yl)pyrimidin-2-ylsulfan­yl]acetato}­zinc
  19. 619
    “…In the title compound, C(15)H(17)N(3)O(3), the dihedral angle between the pyrimidine and benzene rings is 87.0 (7)°. In the crystal, mol­ecules are linked into inversion dimers with R (2) (2)(8) graph-set motifs by a pair of N—H⋯O hydrogen bonds. …”
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    N-(4,6-Dimeth­oxy­pyrimidin-2-yl)-2-(3-methyl­phen­yl)acetamide
  20. 620
    “…In the mononuclear title compound, [Ni(C(10)H(9)N(4)O(2)S)(2)(C(12)H(8)N(2))], the Ni(II) atom has a distorted octa­hedral coordination geometry comprising four N atoms from two 4-amino-N-(pyrimidin-2-yl)benzene­sulfonamidate ligands and two N atoms from a 1,10-phenanthroline ligand. …”
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    Bis[4-amino-N-(pyrimidin-2-yl)benzene­sulfonamidato](1,10-phenanthroline)nickel(II)
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