Results 171 to 180 of about 4,108 (208)

Facile synthesis of spirooxindole-pyrazolines and spirobenzofuranone-pyrazolines and their fungicidal activity

Organic & Biomolecular Chemistry, 2015
A new and facile synthetic method is developed for biologically important spirooxindole-pyrazolines and spirobenzofuranone-pyrazolines.
Changjiang, Yang, Juanjuan, Li, Rong, Zhou, Xiangyu, Chen, Yunpeng, Gao, Zhengjie, He   +5 more
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Preparation of the simplest ?1-pyrazolines by isomerization of ?2-pyrazolines

Chemistry of Heterocyclic Compounds, 1971
Δ2-Pyrazolines that do not have substituants in the 1- and 3-positions are not capable of isomerization to 3-substituted pyrazolines and can be converted to Δ1-pyrazolines by slow distillation in the presence of bases. This method, which is completely analogous to the synthesis of azo compounds from alkylhydrazones, gives good results when applied to 4-
B. V. Ioffe, N. B. Burmanova
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On the stereochemistry of pyrazolines: 1-Acetyl-3,5-disubstituted pyrazolines-2

Journal of Organometallic Chemistry, 1984
Abstract The geometries of the molecules of the isomeric N -acetyl derivatives of 3-ferrocenyl-5- p -bromophenyl- and 3- p -bromophenyl-5-ferrocenylpyrazolines-2 with a chiral centre in position 5 of pyrazoline have been determined by an X-ray study.
V.G. Andrianov, Yu.T. Struchkov, V.N. Postnov, E.I. Klimova, V.A. Sazonova   +4 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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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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Steroidal pyrazoline and pyrazole

Journal of Chemical & Engineering Data, 1987
Synthese des composes du titre a partir de l'acetoxy-3 pregnene-5one-20 et du pyridinecarbaldehyde ...
Charalambos Camoutsis, Sotirios Nicolaropoulos, Panayotis Catsoulacos   +2 more
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Δ¹‐pyrazolines: (Pyrazol and pyrazoline derivatives II

Recueil des Travaux Chimiques des Pays-Bas, 1943
AbstractΔ1‐pyrazolines, in which the double bond is situated between the two nitrogen atoms can be prepared by the addition of diphenyldiazomethane to the diphenyl ester of citraconic acid and to the trimethyl ester of aconitic acid. These compounds split off nitrogen at higher temperatures forming cyclopropane derivatives.Diphenyl diazomethane ...
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Discovery of novel pyrazoline insecticides

Pest Management Science
AbstractBACKGROUNDThe pyrazoline insecticides, invented by Philips Duphar in the 1970s, provide excellent control of lepidopterans and coleopterans and introduced a novel mode of action (MoA) as sodium‐channel‐blocking insecticides, but were not commercialized due to unacceptable persistence.
Rupsha Chaudhuri, Smriti Khanna, Pravin Lokhande, Vikas Sable, Vincent L. Salgado, Barbara J. Wedel   +5 more
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5-Hydrazino-2-pyrazolines

Chemistry of Heterocyclic Compounds, 1987
1-Acyl-5-hydrazino-2-pyrazolines have been obtained by reaction of the appropriate hydrazines with aliphatic 1,3-diketones, 1-acyl-5-hydroxy-2-pyrazolines, and 1-acyl-5-methylene-2-pyrazolines. The latter were synthesized by acylating 3,4,4,5-tetramethyl-4H-pyrazole with carboxylic anhydrides.
K. N. Zelenin, M. Yu. Malov, I. V. Zerova, P. B. Terent'ev, A. G. Kalandarishvili   +4 more
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1,3,5-Triaryl-?2-pyrazoline

Monatshefte f�r Chemie, 1969
2-Jod-3-chlor-1,3-diphenyl-1-propanone reagieren mit Phenylhydrazin zu 1,3,5-Triaryl-Δ2-pyrazoline. Die Reaktion verlauft unter Eliminierung von JCl uber die Chalkone und deren Reaktion mit uberschussigem Phenylhydrazin.
F. G. Weber, K. Brosche, Ch. Seedorf, A. Rinow   +3 more
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