Results 191 to 200 of about 34,622 (239)

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
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DEAD-Mediated Oxidative Ugi/Aza-Wittig Reaction for the Synthesis of 5-(1,2,3,4-Tetrahydroisoquinolin-1-yl)-1,3,4-oxadiazoles Starting from (N-Isocyanimine)triphenylphosphorane

Synthesis, 2020
A one-pot protocol for the synthesis of 5-(1,2,3,4-tetrahydroisoquinolin-1-yl)-1,3,4-oxadiazoles via DEAD-mediated oxidative Ugi/aza-Wittig reaction has been developed.
M. Ding, Mei Sun, Long Zhao, Yanhua Yu
semanticscholar   +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
openaire   +1 more source

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

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 ...
openaire   +1 more source