Zobrazeno 1 - 10
of 67
pro vyhledávání: '"Omar A. Al-Deeb"'
Autor:
Monirah A. Al-Alshaikh, Ali A. El-Emam, Omar A. Al-Deeb, Mohammed S. M. Abdelbaky, Santiago Garcia-Granda
Publikováno v:
Acta Crystallographica Section E: Crystallographic Communications, Vol 71, Iss 8, Pp 956-959 (2015)
The title molecular salts, C10H15N2+·C6H6ClN2O2−, (I), and C10H15N2+·C7H8ClN2O2−, (II), consist of 4-phenylpiperazin-1-ium cations with a 6-chloro-5-ethyl-2,4-dioxopyrimidin-1-ide anion in (I) and a 6-chloro-5-isopropyl-2,4-dioxopyrimidin-1-ide
Externí odkaz:
https://doaj.org/article/fffd0bfd8d2d481ca382d2d24eaad2cc
Publikováno v:
Molecules, Vol 16, Iss 6, Pp 4764-4774 (2011)
6-Chloro-5-ethyl-, n-propyl- and isopropyluracils 5a-c were efficiently prepared from the corresponding 5-alkybarbituric acids 3a-c via treatment with phosphorus oxychloride and N,N-dimethylaniline to yield the corresponding 5-alkyl-2,4,6-trichloro-p
Externí odkaz:
https://doaj.org/article/60dc6b8641874d5e893dc22f1c950c99
Autor:
Mohamed I. Attia, Hazem A. Ghabbour, Aida A. El-Azzouny, Omar A. Al-Deeb, Maha S. Almutairi, Hoong-Kun Fun
Publikováno v:
Journal of Chemistry, Vol 2013 (2013)
Synthesis, spectroscopic characterization and X-ray crystal structure of a new (2E)-2-[3-(1H-imidazol-1-yl)-1-phenylpropylidene]-N-phenylhydrazinecarboxamide (4) are reported. The stereochemistry of the title compound 4, C19H19N5O, about the imine bo
Externí odkaz:
https://doaj.org/article/35c171a3157b4c28800018407c4e8a84
Publikováno v:
Acta Crystallographica Section E, Vol 68, Iss 7, Pp o2059-o2060 (2012)
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 pyrimid
Externí odkaz:
https://doaj.org/article/81672d0e5c1a438e968365103a70ee2f
Publikováno v:
Acta Crystallographica Section E, Vol 68, Iss 7, Pp o2054-o2054 (2012)
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
Externí odkaz:
https://doaj.org/article/b18e79f4d56c49c7b222f2467a15336b
Autor:
Ali A. El-Emam, Omar A. Al-Deeb, Abdulghafoor A. Al-Turkistani, Seik Weng Ng, Edward R. T. Tiekink
Publikováno v:
Acta Crystallographica Section E, Vol 68, Iss 7, Pp o2055-o2056 (2012)
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 to
Externí odkaz:
https://doaj.org/article/1d100b11f7544b9c8f9caab186895d7b
Publikováno v:
Acta Crystallographica Section E, Vol 68, Iss 5, Pp o1379-o1379 (2012)
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.
Externí odkaz:
https://doaj.org/article/7a4b04703a1f434a83d684f2a76d321f
Autor:
Edward R. T. Tiekink, Seik Weng Ng, Ali A. El-Emam, Abdulghafoor A. Al-Turkistani, Omar A. Al-Deeb
Publikováno v:
Acta Crystallographica Section E, Vol 68, Iss 3, Pp o676-o677 (2012)
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
Externí odkaz:
https://doaj.org/article/47c8e332a8284401997354f2b8e36a24
Publikováno v:
Acta Crystallographica Section E, Vol 68, Iss 3, Pp o634-o634 (2012)
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
Externí odkaz:
https://doaj.org/article/16a3e4dd657842b0ad76300443daa413
Publikováno v:
Acta Crystallographica Section E, Vol 68, Iss 2, Pp o346-o346 (2012)
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
Externí odkaz:
https://doaj.org/article/23522daf2ee24e79ae2b50fdbe90ba8e