Results 161 to 170 of about 31,521 (214)

Banana-shaped 1,2,4-oxadiazoles

Pramana, 2003
3,5-Disubstituted 1,2,4-oxadiazoles are a new type of liquid crystalline (LC) compounds with asymmetrical five-membered heterocycle as a central unit. They have a bent shape and are very convenient model-compounds for studying the dependence of the LC properties on the molecular design.
S. I. TORGOVA, T. A. GEIVANDOVA, O. FRANCESCANGELI, STRIGAZZI, Alfredo   +3 more
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Synthesis of 1,2,4‐Oxadiazoles

ChemInform, 2006
AbstractFor Abstract see ChemInform Abstract in Full Text.
L. A. Kayukova, G. I. Gapparova
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1,2,4‐Oxadiazoles

ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
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Mass spectrometric analysis of 1,2,4‐Oxadiazoles and 4,5‐Dihydro‐1,2,4‐Oxadiazoles

Mass Spectrometry Reviews, 2004
Abstract1,2,4‐Oxadiazoles and 4,5‐dihydro‐1,2,4‐oxadiazoles are an interesting class of compounds because of their pharmacological and other properties. Although short descriptions of these compounds under mass spectrometric conditions exist, we thought it worthwhile to write a comprehensive review of this class of compounds.
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3,5‐Disubstituted‐1,2,4‐oxadiazoles and 4,5‐dihydro‐3,5‐disubstituted‐1,2,4‐oxadiazoles

Journal of Heterocyclic Chemistry, 1978
AbstractA series of 3,5‐disubstituted‐1,2,4‐oxadiazoles (2) were prepared from a mono‐ or dichlorophenyl‐substituted amidoxime and (i) an acid chloride, (ii) an isatoic anhydride, or (iii) a β‐keto ester. Although cyclizations of the same amidoximes with acetaldehyde gave 4,5‐dihydro‐5‐methyl‐substituted derivatives (5), that annulation procedure ...
Harry L. Yale, E. R. Spitzmiller
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Tandem Reactions of 1,2,4-Oxadiazoles with Allylamines

Organic Letters, 2011
A reaction of 3-chloro-1,2,4-oxadiazoles with allylamine and diallylamine has been investigated. 3,3a,4,5-Tetrahydroisoxazolo[3,4-d]pyrimidines are produced through a tandem ANRORC/[3 + 2]cycloaddition pathway consisting of the addition of allylamine to the 1,2,4-oxadiazole, followed by ring opening, nitrone formation, and finally cycloaddition.
PALUMBO PICCIONELLO, Antonio, PACE, Andrea, BUSCEMI, Silvestre   +2 more
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Synthesis of 3‐Carbamoyl‐1,2,4‐oxadiazoles.

ChemInform, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
V. N. Yarovenko, S. A. Kosarev, I. V. Zavarzin, M. M. Krayushkin   +3 more
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A Suitable 1,2,4‐Oxadiazoles Synthesis by Microwave Irradiation.

ChemInform, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
SANTAGADA, VINCENZO, FRECENTESE, FRANCESCO, PERISSUTTI, ELISA, D. CIRILLO, S. TERRACCIANO, CALIENDO, GIUSEPPE   +5 more
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New synthesis of 1,2,4-oxadiazoles

Tetrahedron, 1990
The interaction of amidoximes with nitriles in the presence of ZnCl 2 and HCl affords 1,2,4-oxadiazoles. The reaction of N-15-labeled amidoximes with nitriles was studied. Elimination of the amino group of the amidoxime fragment was observed in the oxadiazole formation and N-monoalkyl and N,N-dialkylamidoximes can be used in the synthesis of 1,2,4 ...
V.N. Yarovenko, V.K. Taralashvili, I.V. Zavarzin, M.M. Krayushkin   +3 more
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3,3‐Dinitrobutyl‐1,2,4‐oxadiazoles

Journal of Heterocyclic Chemistry, 1980
AbstractThe syntheses of 3,5‐bis(3,3‐dinitrobutyl)‐1,2,4‐oxadiazole and a series of 3‐aryl‐5‐(3,3‐dinitrobutyl)‐1,2,4‐oxadiazoles were accomplished by treating 4,4‐dinitropentanoyl chloride with the appropriate amidoximes to yield the intermediate O‐(4,4‐dinitropentanoyl)amidoximes, which were dehydrated to the 1,2,4‐oxadiazoles.
Mark D. Bjorklund, Michael D. Coburn
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