Results 121 to 130 of about 2,500 (166)

Perfluoro-1,3,4-oxadiazoles

Journal of Fluorine Chemistry, 1992
Abstract Some new polyfluorinated 1,3,4-oxadiazoles have been obtained via a two-step method. The cycloadditions of the 1,3,4-oxadiazoles have been studied and an analysis of the energies of the frontier orbitals calculated by the MNDO method indicates a LUMO-dependent pathway for cycloaddition.
N.V. Vasiliev, Yu.E. Lyashenko, A.E. Patalakha, G.A. Sokolski   +3 more
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Poly‐1,3,4‐oxadiazoles. I. Polyphenylene‐1,3,4‐oxadiazoles

Journal of Polymer Science Part A: General Papers, 1965
AbstractPolyphenylene‐1,3,4‐oxadiazoles have been prepared from benzenedicarboxylic acids or their derivatives and hydrazine by solution polycondensation in fuming sulfuric acid or polyphosphoric acid. These polymers were characterized by good thermal stability, and the molecular weights attained were high enough for the products to exhibit fiber‐or ...
Yoshio Iwakura, Keikichi Uno, Shigeyoshi Hara   +2 more
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Poly‐1,3,4‐oxadiazoles. III. Alicyclic poly‐1,3,4‐oxadiazoles

Die Makromolekulare Chemie, 1966
AbstractSome alicyclic poly‐1,3,4‐oxadiazoles were prepared from cycloalkanedicarboxylic dihydrazides or from cycloalkanedicarboxylic acids and hydrazine sulfate by solution polycondensation in polyphosphoric acid. These polymers were characterized by high melting temperature.
Yoshio Iwakura, Keikichi Uno, Shigeyoshi Hara   +2 more
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Infrared spectra of 1,3,4-oxadiazole and 2,5,-dimethyl-1,3,4-oxadiazole. Vibrational assignment of 1,3,4-oxadiazole

Journal of Molecular Spectroscopy, 1967
Abstract The infrared absorption spectrum of 1,3,4-oxadiazole has been recorded in the region 5000-400 cm −1 in the vapor and in the liquid phases, in CS 2 and C 2 Cl 4 solutions. Also, the infrared absorption spectrum of liquid 2,5-dimethyl-1,3,4-oxadiazole was recorded in the same region. A tentative assignment of the fundamental vibrations of 1,
Daniel Højgaard Christensen, Jørgen Tormod Nielsen, Ole Faurskov Nielsen   +2 more
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ChemInform Abstract: 1,3,4‐Oxadiazole

ChemInform, 2014
AbstractReview: use of oxadiazole derivatives in in various field like polymer industry and, ost notably, medicinal chemistry; 70 refs.
S. B. Dave, P. Godhani, Y. Ushir
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Perfluoro-bis-1,3,4 oxadiazoles

Bulletin of the Academy of Sciences, USSR Division of Chemical Science, 1965
1. The hydrazides of perfluorodicarboxylic acids of the general formula NH2NHCO(CF2)nCONHNH2 (n= 3,4,8,12) were produced by the action of hydrazine hydrate on the diethyl esters of the perfluorodicarboxylic acids in alcohol solutions. 2.
M. P. Krasuskaya, D. P. Del'tsova, I. L. Knunyants   +2 more
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Synthesis of 5-Trimethylsilylethynyl-1,3,4-oxadiazoles

Russian Journal of Organic Chemistry, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
M. M. Demina, G. I. Sarapulova, A. I. Borisova, L. I. Larina, A. S. Medvedeva   +4 more
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1,3,4-Oxadiazole: A Biologically Active Scaffold

Mini-Reviews in Medicinal Chemistry, 2012
There has been considerable interest in the development of novel compounds with anticonvulsant, antidepressant, analgesic, anti-inflammatory, antiallergic, antipsychotic, antimicrobial, antimycobecterial, antitumour, antiviral and antitubercular activities. 1,3,4-oxadiazoles constitute an important class of compounds for new drug development. Therefore,
H, Khalilullah, M J, Ahsan, Md, Hedaitullah, S, Khan, B, Ahmed   +4 more
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Aliphatic poly‐1,3,4‐oxadiazoles

Journal of Polymer Science Part A: General Papers, 1965
AbstractThree high molecular weight aliphatic polyoxadiazoles have been prepared by a new route from equimolar amounts of a diphenyl ester of dicarboxylic acid and an anhydrous hydrazine (or a dihydrazide). The resulting polymers have been characterized by microanalysis, intrinsic viscosity, x‐ray diffraction patterns, infrared absorption spectra, and ...
Terunobu Unishi, Masaki Hasegawa
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