Results 131 to 140 of about 7,959 (164)

Keto-1,3,4-oxadiazoles as cathepsin K inhibitors

Bioorganic & Medicinal Chemistry Letters, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
James T, Palmer, Bernard L, Hirschbein, Harry, Cheung, John, McCarter, James W, Janc, Z Walter, Yu, Gregg, Wesolowski   +6 more
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Novel syntheses of symmetrical 2,5-diaryl-1,3,4-oxadiazoles and 1,4-phenylenebis-1,3,4-oxadiazoles

Russian Chemical Bulletin, 1998
The reactions of trichloromethylarenes with excess hydrazine hydrate in ethanol gives symmetrical 2,5-diaryl-1,3,4-oxadiazoles in 68–96% yields. The reaction of 1,4-bis(trichloromethyl)benzene with acylhydrazines in an ethanol-pyridine mixture gives the corresponding substituted or unsubstituted 1,4-phenylenebis-1,3,4-oxadiazoles in 35–51% yields.
L. I. Belen'kii, S. I. Luiksaar, I. S. Poddubnyi, M. M. Krayushkin   +3 more
openaire   +1 more source

Photophysics of Fluorene Copolymers Containing 1,3,4-Oxadiazole or 1,3,4-Oxadiazole and Carbazole Units

The Journal of Physical Chemistry C, 2010
The photophysical properties of a series of 9,9′-dioctylfluorene copolymers containing 1,3,4-oxadiazole units (PF1Ox, PF2Ox, PF3Ox, and PF4Ox) as well as a copolymer containing 9,9-dioctylfluorene, 1,3,4-oxadiazole, and N-octylcarbazole (PFOxCz) have been characterized by fluorescence and time-resolved absorption spectroscopy.
Maykel de Miguel, Mercedes Álvaro, Jianfu Ding, Hermenegildo García   +3 more
openaire   +1 more source

Aromatic Poly‐1,3,4‐Oxadiazole Fibers

Journal of Polymer Science Part C: Polymer Symposia, 1967
AbstractThis work has demonstrated the preparation of aromatic poly‐1,3,4‐oxadiazole fibers with a high level of physical properties by the cyclodehydration of undrawn high molecular weight copolyhydrazide fibers and subsequent drawing of the converted fiber to high orientation. The fibers have a high level of thermal stability, good property retention
A. H. Frazer, T. A. Reed
openaire   +1 more source

Polyimides Containing 1,3,4-Oxadiazole Rings

Collection of Czechoslovak Chemical Communications, 2008
Two series of polyimides containing 1,3,4-oxadiazole rings in the main chain, one of them having flexible hexafluoropropane-2,2-diyl groups and the other with carbonyl groups, were prepared by polycondensation of aromatic diamines containing 1,3,4-oxadiazole rings with hexafluoropropane-2,2-diyl-bis(phthalic anhydride) or benzophenonetetracarboxylic ...
Maria Bruma, Mariana-Dana Damaceanu
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ChemInform Abstract: SACCHARIDE 1,3,4‐OXADIAZOLES

Chemischer Informationsdienst, 1976
AbstractBei einer Behandlung mit Jod und HgO werden die Acylhydrazone (I) zu den entsprechenden Saccharid‐oxadiazolen (III) cyclisiert.
M. SHABAN, M. NASSR
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A Derivative of 1,3,4-Oxadiazole

Acta Crystallographica Section C Crystal Structure Communications, 1995
The molecules of title compound, 2-(4-chloroanilino)-5-(4-pyridyl)-1,3,4-oxadiazole, C 13 H 9 ClN 4 O, are nearly planar with a maximum deviation of 0.094 (2) A from the plane. Intermolecular N(1)-H...N(4') hydrogen bonds link the molecules into chains [N(1)...N(4')= 2.902 (3) A, N(1)-H...N(4')=178 (2)°].
X. Wang, W. Wang, H. X. Liu, M. Y. Tan, M. Li   +4 more
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SYNTHESE D'HYBRIDES 1,3,4-OXADIAZOLE-PHENOTHIAZINE

Phosphorus, Sulfur, and Silicon and the Related Elements, 1999
Abstract A variety of 1,3,4-oxadiazoles 1 linked to the N atom of the phenothiazine framework through a two carbon atom chain has been prepared by condensation of the 3-(10H-phenothiazin-10-yl)propionic hydrazide 2 with different sulfurated reagents (CS2, isothiocyanates, O-ethyl thiocarboxylates) and subsequent cyclization of the resulting products ...
Elena Bâcu, Magda Petrovanu, Axel Couture, Pierre Grandclaudon   +3 more
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ChemInform Abstract: Perfluoro‐1,3,4‐oxadiazoles.

ChemInform, 1994
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
N. V. VASILIEV, YU. E. LYASHENKO, A. E. PATALAKHA, G. A. SOKOLSKI   +3 more
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New mesogenic 1,3,4-oxadiazole derivatives

Liquid Crystals, 1991
Abstract The synthesis of novel liquid-crystalline heteroaromatic compounds incorporating the five membered 1,3,4-oxadiazole ring is described. Due to the bent molecular structure of the oxadiazole ring their mesophase stability is low if the heterocyclic ring occupies a central position, but it is increased if this ring is shifted to a terminal ...
Dalia Girdziunaite, Carsten Tschierske, Eva Novotna, Horst Kresse, Annemarie Hetzheim   +4 more
openaire   +1 more source