Results 141 to 150 of about 928 (176)

Pyrazolines IX. Chemistry of some 3-cyano-3-carbomethoxy-1-pyrazolines

Canadian Journal of Chemistry, 1969
Product and kinetic studies have been made on the pyrolysis of a series of 3-cyano-3-carbomethoxy-1-pyrazolines substituted at C-4 with a methyl and an aryl group (phenyl, p-methoxyphenyl, and p-nitrophenyl). Evidence is presented supporting a transition state structure in which little progress to bond breaking of the C-5 to N bond has taken place at ...
Donald E. McGreer, Y. Y. Wigfield
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New pyrazoline derivatives and their antidepressant activity

European Journal of Medicinal Chemistry, 2010
Some triazolo-pyrazoline derivatives were synthesized to investigate their potential antidepressant activities. The chemical structures of the compounds were elucidated by IR, NMR and FAB(+)-MS spectral data and elemental analyses. Antidepressant-like activities of the test compounds (100 mg/kg) were screened using both modified forced swimming and ...
Kaplancıklı, Zafer Asım, Özdemir, Ahmet, Turan, Gülhan, Altıntop, Mehlika Dilek, Can, Özgür Devrim   +4 more
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Pyrazolines and their rearrangement to form pyrazoles. II. (Pyrazole and pyrazoline derivatives, IV)

Recueil des Travaux Chimiques des Pays-Bas, 1943
AbstractUpon the addition of diphenylenediazomethane to the methyl esters of acetylene dicarbonic acid, of phenylpropiolic acid and of propiolic acid, pyrazolenines are formed which, under different circumstances and with the migration of several groups, undergo rearrangement to give pyrazoles.
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A study of pyrazolin-5-one tautomerism—II

Tetrahedron, 1969
Abstract The tautomerism of four 1-aryl-2-pyrazolin-5-ones not bearing a 3-substituent has been studied using NMR and IR spectroscopy. In carbon tetrachloride and chloroform solutions compounds without a 4-substituent exist essentially in the CH form (I). However, in the presence of a 4-ethoxycarbonyl substituent the NH form (II) is favoured. Results
G.A. Newman, P.J.S. Pauwels
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ChemInform Abstract: Reactions of Pyrazolin‐Azomethin Dyes with 2‐Pyrazolin‐5‐one.

Chemischer Informationsdienst, 1986
AbstractThe dyes (III), obtained from the pyrazolinone (I) and the oxidized photographic developer (II), are decolorized with excess (I) by the formation of the bispyrazolone (IV) in two steps.
J. GACA, K. KOZLOWSKI, M. TRZCINSKA, Z. KUCYBALA   +3 more
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ChemInform Abstract: STEROIDAL PYRAZOLINES

Chemischer Informationsdienst, 1978
AbstractBei der Umsetzung mit den Phenylhydrazonen (IIa) und (IIb) erhält man aus 21‐Benzal‐5‐pregnen‐3β‐ol‐20‐on‐acetat (I) die Cyclisierungsprodukte (III).
P. CATSOULACOS, C. I. STASSINOPOULOU
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2‐pyrazolines with herbicidal activity

Pesticide Science, 1990
AbstractN‐(2‐pyrazolin‐1‐ylformyl)benzenesulfonamides form a new group of compounds with interesting herbicidal activity. Some of the chemical, biological and biochemical characteristics of this group are described. The herbicidal activity is mainly expressed as a post‐emergence activity on dicotyledonous weed species. The compounds appear to interfere
Jac H. H. Eussen, Jo L. G. Thus, Koos Wellinga, Bob Stork   +3 more
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Pyrazoline and Pyrazoline Derivatives as Anti-Cancer Agents: Synthesis and Biological Activities: A Compressive Review

Current Topics in Medicinal Chemistry
Background: A heterocyclic molecule containing five rings, three carbon atoms, two nitrogen atoms, and a single endocyclic bond is called pyrazoline. Because of its intriguing electrical characteristics and potential for dynamic applications, pyrazoline is one type of electron-rich nitrogen carrier that is becoming more and more popular.
Pushkar Kumar Ray, Ruchi Sharma, Abhishek Kumar   +2 more
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Evaluating the Synthesis of Bis‐pyrazolines

Journal of Heterocyclic Chemistry, 2013
The bis‐cyclization of chalcone with thiosemicarbazide under basic condition led to the formation of new compounds, thiocarbamoyl bis‐pyrazoline derivatives. Bis‐chalcones were prepared by a Claisen–Schmidt condensation between 1 mol bis‐aldehyde and 2 mol acetophenone derivatives in the presence of sodium hydroxide as a catalyst. The structures of all
Nosrat O. Mahmoodi, Bahman Sharifzadeh, Manouchehr Mamaghani, Khalil Tabatabaeian   +3 more
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Electrochemical Synthesis of Pyrazolines and Pyrazoles via [3+2] Dipolar Cycloaddition

Angewandte Chemie - International Edition, 2023
Silja Hofmann, Siegfried R Waldvogel
exaly