Results 181 to 190 of about 8,535 (227)

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
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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
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1,3,4-Oxadiazole based liquid crystals

Journal of Materials Chemistry C, 2013
Liquid crystals with 1,3,4-oxadiazole units in the aromatic core have attracted considerable attention due to their rich mesophases, high photoluminescence quantum yields, good electron transporting ability and excellent thermal stabilities. In this feature article, 1,3,4-oxadiazole-based liquid crystals are classified into three categories according ...
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General Synthesis of Tetrasubstituted Alkenyl‐1,3,4‐oxadiazoles.

ChemInform, 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.
Clint A. James, Brigitte Poirier, Christiane Grisé, Alain Martel, Edward H. Ruediger   +4 more
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ChemInform Abstract: Synthesis and Antioxidant Activity of Styrylsulfonylmethyl 1,3,4‐Oxadiazoles, Pyrazolyl/Isoxazolyl‐1,3,4‐oxadiazoles.

ChemInform, 2014
AbstractCompound (IIIb) is found to exhibit slightly higher antioxidant activity than the standard ascorbic acid.
Guda Mallikarjuna Reddy, Akkarapalli Muralikrishna, Venkatapuram Padmavathi, Adivireddy Padmaja, Thandaiah Krishna Tilak, Chippada Appa Rao   +5 more
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