Results 151 to 160 of about 40,557 (208)

A Preferred Synthesis of 1,2,4‐Oxadiazoles

Synthetic Communications, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
Brenda Pipik, Guo‐Jie Ho, J. Michael Williams, David A. Conlon   +3 more
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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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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
openaire   +1 more source

Electronic structure and chemical properties of 1,2,4-oxadiazole, bis-1,2,4-oxadiazoles and other derivaties

Tetrahedron, 1968
Abstract 1,2,4-oxadiazole and various possible bis-1,2,4-oxadiazoles and di-(1,2,4-diazolyl)ethylenes have been studied by the Pariser-Parr-Pople approximation of the M.O.A.S.M.O. method. A discussion of the chemical properties and of the electronic absorption spectrum is given for the known compounds, and predictions are made about those derivatives
L. Paoloni, M. Cignitti
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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
openaire   +1 more source