Results 121 to 130 of about 2,679 (180)
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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 +3 more
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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 +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, 1965AbstractPolyphenylene‐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 +2 more
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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 +2 more
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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 +2 more
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Chinese Chemical Letters, 2022
Abstract A facile synthesis of 1,3,4-oxadiazoles and 1,3,4-oxadiazoles-d5 via [4 + 1] cyclization of ClCF2COONa with non-amine compounds containing amino groups is developed. Of note, this is the first time that halofluorinated compounds are used as C1 synthon to construct deuterated nitrogen-heterocyclic compounds.
Ya Wang +3 more
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Abstract A facile synthesis of 1,3,4-oxadiazoles and 1,3,4-oxadiazoles-d5 via [4 + 1] cyclization of ClCF2COONa with non-amine compounds containing amino groups is developed. Of note, this is the first time that halofluorinated compounds are used as C1 synthon to construct deuterated nitrogen-heterocyclic compounds.
Ya Wang +3 more
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Poly‐1,3,4‐oxadiazoles. III. Alicyclic poly‐1,3,4‐oxadiazoles
Die Makromolekulare Chemie, 1966AbstractSome 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 +2 more
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A Derivative of 1,3,4-Oxadiazole
Acta Crystallographica Section C Crystal Structure Communications, 1995The 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 +4 more
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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 +3 more
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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 +3 more
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Synthesis of 5-Trimethylsilylethynyl-1,3,4-oxadiazoles
Russian Journal of Organic Chemistry, 2003AbstractFor Abstract see ChemInform Abstract in Full Text.
M. M. Demina +4 more
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