Results 261 to 270 of about 30,682 (325)
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Organic Letters, 2017
A novel and atom-economical synthesis of fully substituted 4-aminoimidazoles via gold-catalyzed selective [3 + 2] annulation of 1,2,4-oxadiazoles with ynamides is reported.
Zhongyi Zeng +6 more
semanticscholar +1 more source
A novel and atom-economical synthesis of fully substituted 4-aminoimidazoles via gold-catalyzed selective [3 + 2] annulation of 1,2,4-oxadiazoles with ynamides is reported.
Zhongyi Zeng +6 more
semanticscholar +1 more source
Bioisosterism: 1,2,4‐Oxadiazole Rings
ChemMedChem, 2023AbstractAlthough studies in drug discovery have gained momentum in recent years, the conversion of drugs in use today into less toxic derivatives with pharmacologically superior properties is still of great importance in drug research. Bioisosterism facilitates the conversion of drugs into derivatives that present more positive pharmacological and ...
Merve Camci, Nilgün Karali
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Pushing the Limits of Oxygen Balance in 1,3,4-Oxadiazoles.
Journal of the American Chemical Society, 2017Gem-trinitromethyl groups were introduced into a 1,3,4-oxadiazole ring to give the first example of a bifunctionalized single five-membered ring with six nitro groups. 2,5-Bis(trinitromethyl)-1,3,4-oxadiazole (12) has a high calculated crystal density of
Qiong Yu +6 more
semanticscholar +1 more source
Oxadiazole-Triphenylamine derivatives for OLEDs
SPIE Proceedings, 2005Electroluminescent bipolar small molecules have been attracted with great interests recently. They are found to exhibit many interesting features such as (i) reducing the structural complexity of organic light emitting diodes (OLEDs) from multilayer heterojunction to monolayer homojunction devices; (ii) offering molecular p/n junction, and (iii ...
Louis M L Leung +8 more
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Organic Letters, 2017
A gold-catalyzed formal [3 + 2] cycloaddition of ynamides with 4,5-dihydro-1,2,4-oxadiazoles has been developed. The reaction provides a concise and regioselective access to highly functionalized 4-aminoimidazoles likely via the formation of an α-imino ...
W. Xu +3 more
semanticscholar +1 more source
A gold-catalyzed formal [3 + 2] cycloaddition of ynamides with 4,5-dihydro-1,2,4-oxadiazoles has been developed. The reaction provides a concise and regioselective access to highly functionalized 4-aminoimidazoles likely via the formation of an α-imino ...
W. Xu +3 more
semanticscholar +1 more source
Oxidative Cyclization Protocol for the Preparation of Energetic 3-Amino-5- R-1,2,4-oxadiazoles.
Organic Letters, 2018An efficient method has been developed for the synthesis of energetic 3-amino-5- R-1,2,4-oxadiazoles via iodobenzene diacetate (IBD)-mediated oxidative cyclization in high yields at ambient temperature.
Yongxing Tang +3 more
semanticscholar +1 more source
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 ...
Shigeyoshi Hara +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,
Jørgen Tormod Nielsen +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,
Jørgen Tormod Nielsen +2 more
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The new era of 1,2,4-oxadiazoles
Organic & Biomolecular Chemistry, 2009AbstractChemInform 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.
PACE, Andrea, PIERRO, Paola
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