Results 21 to 30 of about 27,892 (233)

Efficient synthesis of 1,3-diaryl-4-halo-1H-pyrazoles from 3-arylsydnones and 2-aryl-1,1-dihalo-1-alkenes

Beilstein Journal of Organic Chemistry, 2011
An efficient synthesis of 1,3-diaryl-4-halo-1H-pyrazoles was achieved. The synthesis involves the [3 + 2] dipolar cycloaddition of 3-arylsydnones and 2-aryl-1,1-dihalo-1-alkenes. The process proceeds smoothly in moderate to excellent yields. 1,3-Diaryl-4-
Yiwen Yang, Chunxiang Kuang, Hui Jin, Qing Yang, Zhongkui Zhang   +4 more
doaj   +1 more source

3-(4-Fluorophenyl)-1-(1-(4-fluorophenyl)-3,3,3-trifluoroprop-1-en-1-yl)-5-fluoro-1H-pyrazole

Molbank, 2023
In this work, the title compound was synthesized via the visible-light-induced radical denitrogenative trifluoromethylation of the corresponding vinyl azide followed by Cs2CO3-mediated defluorinative cyclization of the resultant azine.
Stanislav A. Paveliev, Alexander O. Ustyuzhanin, Igor B. Krylov, Alexander O. Terent’ev   +3 more
doaj   +1 more source

Electrooxidation Is a Promising Approach to Functionalization of Pyrazole-Type Compounds

Molecules, 2021
The review summarizes for the first time the poorly studied electrooxidative functionalization of pyrazole derivatives leading to the C–Cl, C–Br, C–I, C–S and N–N coupling products with applied properties.
Boris V. Lyalin, Vera L. Sigacheva, Anastasia S. Kudinova, Sergey V. Neverov, Vladimir A. Kokorekin, Vladimir A. Petrosyan   +5 more
doaj   +1 more source

Synthesis of tetrasubstituted pyrazoles containing pyridinyl substituents

Beilstein Journal of Organic Chemistry, 2017
A synthesis of tetrasubstituted pyrazoles containing two, three or four pyridinyl substituents is described. Hence, the reaction of 1,3-dipyridinyl-1,3-propanediones with 2-hydrazinopyridine or phenylhydrazine, respectively, affords the corresponding 1,3,
Josef Jansa, Ramona Schmidt, Ashenafi Damtew Mamuye, Laura Castoldi, Alexander Roller, Vittorio Pace, Wolfgang Holzer   +6 more
doaj   +1 more source

Two isostructural 3-(5-aryloxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)-1-(thiophen-2-yl)prop-2-en-1-ones: disorder and supramolecular assembly

Acta Crystallographica Section E: Crystallographic Communications, 2020
Two new chalcones containing both pyrazole and thiophene substituents have been prepared and structurally characterized. 3-(3-Methyl-5-phenoxy-1-phenyl-1H-pyrazol-4-yl)-1-(thiophen-2-yl)prop-2-en-1-one, C23H18N2O2S (I), and 3-[3-methyl-5-(2-methylphenoxy)
Mohammed A. E. Shaibah, Hemmige S. Yathirajan, Nagaraj Manju, Balakrishna Kalluraya, Ravindranath S. Rathore, Christopher Glidewell   +5 more
doaj   +1 more source

Dinuclear Copper(I) Complexes Supported by Bis‐Tridentate N‐Donor‐Ligands: Turning‐On Tyrosinase Activity

European Journal of Inorganic Chemistry, Volume 2022, Issue 35, December 16, 2022., 2022
Dinuclear copper(I) complexes supported by bis‐tridentate N‐donor ligands with two imine functions mediate the conversion of a monophenol to its corresponding o‐quinone, in contrast to analogous complexes supported by ligands with amine functions. Abstract Four structurally related bis‐tridentate N‐donor ligands with either two secondary amine or two ...
Rebecca Schneider, Tobias A. Engesser, Jessica N. Hamann, Christian Näther, Felix Tuczek   +4 more
wiley   +1 more source

Mono- and Mixed Metal Complexes of Eu³⁺, Gd³⁺, and Tb³⁺ with a Diketone, Bearing Pyrazole Moiety and CHF₂-Group: Structure, Color Tuning, and Kinetics of Energy Transfer between Lanthanide Ions

Molecules, 2021
Three novel lanthanide complexes with the ligand 4,4-difluoro-1-(1,5-dimethyl-1H-pyrazol-4-yl)butane-1,3-dione (HL), namely [LnL3(H2O)2], Ln = Eu, Gd and Tb, were synthesized, and, according to single-crystal X-ray diffraction, are isostructural.
Victoria E. Gontcharenko, Mikhail A. Kiskin, Vladimir D. Dolzhenko, Vladislav M. Korshunov, Ilya V. Taydakov, Yury A. Belousov   +5 more
doaj   +1 more source

Boosting the Donor Effect of Side‐On W(II) Alkyne Complex Based Diphosphines

European Journal of Inorganic Chemistry, Volume 2022, Issue 36, December 27, 2022., 2022
The donor strength of redox‐active alkyne based diphosphine ligands is substantially improved, as determined by NMR studies with the corresponding P‐selenides. The metalla‐diphosphines could then be employed to form a series of heterobimetallic complexes of Ni(II) and Cu(I) as examples of the first transition metal row.
Paula Thiem, Stephan Ludwig, Alexander Villinger, Wolfram W. Seidel   +3 more
wiley   +1 more source

Enantiomeric-Enriched Ferrocenes: Synthesis, Chiral Resolution, and Mathematic Evaluation of CD-chiral Selector Energies with Ferrocene-Conjugates

Molecules, 2017
Enantiomeric-enriched ferrocene-modified pyrazoles were synthesized via the reaction of the ferrocene alcohol, (S)-FcCH(OH)CH3 (Fc = ferrocenyl), with various pyrazoles in acidic conditions at room temperature within several minutes.
Lubov V. Snegur, Yurii A. Borisov, Yuliya V. Kuzmenko, Vadim A. Davankov, Mikhail M. Ilyin, Mikhail M. Ilyin, Dmitry E. Arhipov, Alexander A. Korlyukov, Sergey S. Kiselev, Alexander A. Simenel   +9 more
doaj   +1 more source

(E)-5-(4-Methoxyphenyl)-N′-(2-oxoindolin-3-ylidene)-1-phenyl-1H-pyrazole-3-carbohydrazide

IUCrData, 2023
The asymmetric unit of the title compound, C25H19N5O3, is composed of two independent molecules with slightly different conformations. The extended structure features N—H...O hydrogen bonds as well as π–π interactions.
Bakr F. Abdel-Wahab, Abdelbasset A. Farahat, Mohamed S. Bekheit, Emad Yousif, Benson M. Kariuki, Gamal A. El-Hiti   +5 more
doaj   +1 more source