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Journal articles on the topic '4-dihydro-3H-pyrazol-3-one'

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Published: 7 June 2025

Last updated: 2 August 2025

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1

Surati, P. R. "Photochromic and Electrochromic Study of Schiff Bases Containing Pyrazolone and Anthracene unit." Журнал структурной химии 64, no. 6 (2023): 111515. http://dx.doi.org/10.26902/jsc_id111515.

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New Schiff bases 4-((anthracen-2-ylimino) methyl)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one (1C), 4-(1-(anthracen-2-ylimino)ethyl)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one (2C) and 4-((anthracen-2-ylimino)(phenyl)methyl)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one (3C) were synthesised and characterized by elemental analyses, LC-MS, FTIR and 1H-NMR spectra. The photochromic property of the synthesised compound investigated under 365 nm UV-light irradiation, which can be observed with solution and solid state absorption spectra. The kinetics study show that the photochromic reacti

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2

Mauf, Ruwa M., and Neam H. Saleem. "PREPARATION, IDENTIFICATION AND STUDY THE BIOLOGICAL ACTIVITY OF NOVEL HETEROCYCLIC COMPOUNDS DERIVED FROM AZO–CHALCONE." Chemical Problems 23, no. 2 (2025): 272–85. https://doi.org/10.32737/2221-8688-2025-2-272-285.

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This work describes the preparation and spectroscopic investigation of new heterocyclic compounds derived from the 4-aminoantipyrene moiety. The compound (R1)3-((1,5-dimethyl-3-oxo-2phenyl-2,3-dihydro-1H-pyrazol-4-yl)diaz-enyl)-4-hydroxybenzaldehyde was prepared by reacting 4aminoantipyrene with 4-Hydroxybenzaldehyde according to the cold condition at (0-5) Celsius. This represents the starting point to create novel azo-chalcone compounds with a new nucleus as the alpha-beta unsaturated group, and the formation of compound (R2-6) via acetophenone derivatives using ethanol as a solvent under a

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3

Konovalova, Irina, Anna Geleverya, Anton Semenets, Sergiy Kovalenko, and Guido J. Reiss. "Synthesis and crystal structure of (Z)-4-((1-(3-fluorophenyl)-1H-1,2,3-triazol-4-yl)methylene)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one, C19H14FN5O." Zeitschrift für Kristallographie - New Crystal Structures 239, no. 5 (2024): 877–80. https://doi.org/10.1515/ncrs-2024-0213.

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The synthesis and crystal structure of (Z)-4-((1-(3-fluorophenyl)-1H-1,2,3-triazol-4-yl)methylene)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one are described. C19H14FN5O, monoclinic, P21/c (no. 14), a = 7.2944(3)Å, b = 12.2032(5)Å, c = 18.1070(7)Å, β = 95.807(4)°, V = 1603.52(11)Å3, Z = 4, Rgt(F) = 0.0451, wRref = 0.1217, T = 100(2)K.

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4

Gloe, Karsten, Bieluonwu A. Uzoukwu, and Otto Rademacher. "4-Acetyl-5-methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one hydrate." Acta Crystallographica Section C Crystal Structure Communications 56, no. 12 (2000): e580-e581. http://dx.doi.org/10.1107/s0108270100015031.

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5

Ryzhkova, Yuliya E., Fedor V. Ryzhkov, Oleg I. Maslov, and Michail N. Elinson. "2,4-Diamino-5-(5-hydroxy-1-phenyl-3-(trifluoromethyl)-1H-pyrazol-4-yl)-5H-chromeno[2,3-b]pyridine-3-carbonitrile." Molbank 2023, no. 1 (2023): M1541. http://dx.doi.org/10.3390/m1541.

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5H-Chromeno[2,3-b]pyridines are important compounds with industrial, biological, and medicinal properties. In this short note, the multicomponent reaction of salicylaldehyde, malononitrile dimer, and 2-phenyl-5-(trifluoromethyl)-2,4-dihydro-3H-pyrazol-3-one in dimethyl sulfoxide at ambient temperature was investigated to give 2,4-diamino-5-(5-hydroxy-1-phenyl-3-(trifluoromethyl)-1H-pyrazol-4-yl)-5H-chromeno[2,3-b]pyridine-3-carbonitrile with good yield. The structure of the previously unknown chromeno[2,3-b]pyridine derivative was confirmed by elemental analysis, mass, nuclear magnetic resonan

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6

Naganagowda, Gadada, and Amorn Petsom. "4-[(2-Hydroxy-4-pentadecylbenzylidene)amino]-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one." Molbank 2012, no. 1 (2012): M750. http://dx.doi.org/10.3390/m750.

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7

Godwin, J., U. J. Chukwu, and T. D. Gad. "DISTRIBUTION OF IRON (II) BETWEEN BUFFERED AQUEOUS SOLUTIONS AND CHLOROFORM SOLUTION OF N,N’-ETHYLENEBIS(4-BUTANOYL-2,4-DIHYDRO-5-METHYL-2-PHENYL-3H-PYRAZOL-3-ONEIMINE)." JOURNAL OF ADVANCES IN CHEMISTRY 8, no. 2 (2012): 1581–89. http://dx.doi.org/10.24297/jac.v8i2.4039.

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The distribution of Fe(II) between buffered aqueous solution and chloroform solution of N,N’-Ethylenebis(4-butanoyl-2-4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-oneimine)(H2BuEtP) was investigated. The effect of 4-butanoyl-2-4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one(HBuP) in the distribution was also studied. Fe(II) concentration in aqueous raffinate was determined colorimetrically and distribution ratios and percentage extractions calculated by difference from Fe(II) in aqueous phase before and after equilibrations. The optimal pH for Fe(II) distribution slightly lowered to 8.00 in mixed lig

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8

Akishina, E. A., D. V. Kazak, E. A. Dikusar, et al. "Heterocyclic Derivatives of 4-Amino-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one." Russian Journal of General Chemistry 90, no. 8 (2020): 1432–38. http://dx.doi.org/10.1134/s1070363220080095.

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9

Bireddy, Srinivasa Reddy, Mohammad Rafeeq, and Venkata Ramana Reddy Chittireddy. "Synthesis of 2‐(3‐methyl‐5‐oxo‐4,5‐dihydro‐1H‐pyrazol‐1‐yl) quinazolin‐4(3H)‐one derivatives." Vietnam Journal of Chemistry 59, no. 1 (2021): 73–78. http://dx.doi.org/10.1002/vjch.202000122.

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AbstractA simple, synthesis of 2‐(3‐methyl‐5‐oxo‐4, 5‐dihydro‐1h‐pyrazol‐1‐yl) quinazolin‐4(3H)‐one 6(a‐d) derivatives, an easy, clean, and economical methodology has been defined. The development of a new pathway for the preparation of substituted derivatives of Quinazoline Pyrazole is highlighted in this report. The mild, inexpensive polyphosphoric acid has proven to be an effective catalyst for excellent yields in the above multi‐component reaction. Widely available and mostly benign catalyst and easy purification are among the several attractive features.

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10

Yakypova, L. R., L. A. Baeva, and R. L. Safiullin. "Reactivity of Peroxyl Radicals with 5-Methyl-4-[(Propylsulfanyl)methyl]-2,4-Dihydro-3H-Pyrazol-3-one." Kinetics and Catalysis 62, no. 1 (2021): 56–61. http://dx.doi.org/10.1134/s0023158421010134.

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11

Dikusar, E. A., E. A. Akishina, N. A. Zhukovskaya, et al. "Synthesis of Formylphenyl 1-Oxo-1,2,3,6,7,7a-hexahydro-3a,6-epoxyisoindole-7-carboxylates and Their (E)-1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-yliminomethyl Derivatives." Žurnal obŝej himii 94, no. 7 (2024): 786–804. https://doi.org/10.31857/s0044460x24070016.

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Formylphenyloxohydroepoxyisoindole carboxylates were prepared by the reaction of 4-hydroxy-3-methoxy-, 4-hydroxy-3-ethoxy- and 3-hydroxy-4-methoxybenzaldehydes with substituted isoindolecarboxylic acids {2-methyl-1-oxo-1,2,3,6,7,7a-hexahydro-3a,6-epoxyisoindole-7-carboxylic, 2-(3,4-dimethoxyphenethyl)1-oxo-1,2,3,6,7,7a-hexahydro-3a,6-epoxyisoindole-7-carboxylic, 2-(benzo[d][1,3]dioxol-5-ylmethyl)-1-oxo1,2,3,6,7,7a-hexahydro-3a,6-epoxyisoindole-7-carboxylic, 6-oxo-3,4,6,6a,7,8-hexahydro-2H,10bH-8,10a-epoxy[1,3]oxazino[2,3-a]isoindole-7-carboxylic, 2-(2,3-dichlorobenzyl)-1-oxo-1,2,3,6,7,7a-hexah

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12

P., N. BANGROO, C. ARORA H., N. RAO G., and R. JAGGA C. "Solvent Extraction of Europium(III) and Neodymium(III) with 4(p)-NitrobenzoyI-2,4-dihydro-5-methyl-2-phenyI- 3H - pyrazol-3-one and Neutral Oxo-donors." J. Indian Chem. Soc. Vol. 66, Jul 1989 (1989): 445–47. https://doi.org/10.5281/zenodo.5995077.

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<strong>A</strong>tomic Minerals Division, Department of Atomic, Energy, R. R. Puram, New Delhi-110 066 Indian Institute of Technology, New Delhi-110 029 <em>Manuscript ,received 3 February 1989, accepted 4 May 1989</em> The mechanism of the extraction of europium(III) and neodymium(III) from aqueous buffer media with 4(<em>p</em>)-nitrobenzoy1-2,4-dihydro-5-methy1-2- pheny1-3H-pyrazol-3-one (NMPP) in toluene has been investigated. The value of log <em>Kex. </em>(where <em>Kex. </em>refers to the equilibrium M<sup>2+</sup>+ 3HL<strong>\(\rightleftharpoons\)</strong>ML<sub>2</sub><sup> &nb

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13

K.K, Sivakumar, and Rajasekaran A. "Synthesis, in-vitro Antimicrobial and Antitubercular Screening of Some Schiff Base of 5-amino-4-[2-(4-phenyl-1,3-thiazol-2-yl)hydrazinylidene]-2,4-dihydro-3H-pyrazol-3-one." International Journal of Drug Design and Discovery 4, no. 2 (2025): 1065–76. https://doi.org/10.37285/ijddd.4.2.5.

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New series of some Schiff bases of 5-amino-4-[2-(4-phenyl-1,3-thiazol-2-yl)hydrazinylidene]-2,4-dihydro-3H-pyrazol-3-one(TZP3a-l)has been synthesized. Title compounds were screened for their preliminary antimicrobial activity against Gram-positiveand Gram-negative bacteria as well as fungal strains. Antimycobacterialactivities of synthesized compounds werescreened against Mycobacterium tuberculosis andMycobacterium smegmatis. The synthesized Schiff bases (TZP3a,TZP3b,TZP3c,TZP3dand TZP3l)were found to havesignificantactivity against Gram-positive bacteria. CompoundsTZP3c, TZP3d and TZP3l showe

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14

Huang, Ling, and Ding-Ben Chen. "4-{[(1E)-(3,5-Dibromo-2-hydroxyphenyl)methylene]amino}-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one." Acta Crystallographica Section E Structure Reports Online 61, no. 12 (2005): o4169—o4170. http://dx.doi.org/10.1107/s1600536805037165.

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15

Atalay, Sehriman. "The crystal structure of 4-((3,4-dichlorobenzylidene)amino)-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one, C18H15Cl2N3O." Zeitschrift für Kristallographie - New Crystal Structures 234, no. 1 (2018): 131–32. http://dx.doi.org/10.1515/ncrs-2018-0225.

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16

Kumar, Sachin, Keshari Kishore Jha, Rati Kailash Prasad Tripathi, Nishant Kumar, and Anurag Chaudhary. "Synthesis and Anticonvulsant Evaluation of 3-(5-(4-substitutedphenyl)-4,5-dihydro-1H-pyrazol- 3-ylamino)-2-(2-methylphenyl)quinazolin-4(3H)-one Derivatives." Indian Journal of Pharmaceutical Education and Research 55, no. 2s (2021): s595—s604. http://dx.doi.org/10.5530/ijper.55.2s.132.

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17

Yu, Ming, Jin-Ling Wang, and Fang-Ming Miao. "1,5-Dimethyl-4-{[(E)-3-oxo-3-(2-thienyl)-1-(trifluoromethyl)-1-propenyl]amino}-2-phenyl-1,2-dihydro-3H-pyrazol-3-one." Acta Crystallographica Section E Structure Reports Online 58, no. 11 (2002): o1182—o1184. http://dx.doi.org/10.1107/s1600536802017348.

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18

K.K., Sivakumar, Rajalakshmi G, and Rajasekaran A. "Synthesis, characterization and biological evaluation of Schiff bases of 5-amino-4-[2-(4-nitro-1,3-benzothiazol-2 yl)hydrazinylidene]-2,4-dihydro- 3H-pyrazol-3-one derivatives." International Journal of Drug Design and Discovery 3, no. 4 (2025): 886–97. https://doi.org/10.37285/ijddd.3.4.2.

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In the present work totally 12 Schiff bases of 5-amino-4-[2-(4-nitro-1,3-benzothiazol-2 yl)hydrazinylidene]-2,4-dihydro- 3H-pyrazol-3-one were synthesized. Synthesized compounds were characterized on the basis of physicochemical as well as spectral data (UV, IR, 1HNMR and mass spectra) and evaluated for in vitro anti-microbial, anti-tubercular and cytotoxic activity. All the synthesized compounds (100 Âµg/disc) showed mild to moderate activity against Gram-positive bacteria, more potent or equal activity against Gram-negative bacteria and moderate to significant anti-fungal activity compared w

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19

Belousov, Yury A., Mikhail T. Metlin, Darya A. Metlina, et al. "Self-Assembly of a Two-Dimensional Coordination Polymer Based on Silver and Lanthanide Tetrakis-Acylpyrazolonates: An Efficient New Strategy for Suppressing Ligand-to-Metal Charge Transfer Quenching of Europium Luminescence." Polymers 15, no. 4 (2023): 867. http://dx.doi.org/10.3390/polym15040867.

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A new strategy for the easy polymerization of anionic [Ln(Qcy)4]− (HQcy-4-(cyclohexanecarbonyl)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one) into two-dimensional layers of [AgLn(Qcy)4]n (Ln = Sm, Eu, Gd, Tb and Dy) is proposed by binding the single molecular anions [Ln(Qcy)4]− to silver cations through the coordination of the pyridinic nitrogen atoms of the pyrazolonate rings. The luminescent properties of [AgLn(Qcy)4]n have been studied in detail, and it was shown that the previously described low photoluminescence quantum yield (PLQY) of [Eu(Qcy)4]− is due to Ligand-To-Metal Charge Transf

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20

Zhang, Heng-Qiang, Qiong Wu, Tong-Yin Jin, Ying-Ying Li, and Hong-Li Chen. "Crystal structure of (Z)-2-(4-chlorophenyl)-4-(furan-2-yl(phenylamino)methylene)-5-methyl-2,4-dihydro-3H-pyrazol-3-one, C21H16ClN3O2." Zeitschrift für Kristallographie - New Crystal Structures 233, no. 5 (2018): 883–84. http://dx.doi.org/10.1515/ncrs-2018-0075.

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21

Geleverya, Anna, Anton Semenets, Sergiy М. Kovalenko, Marharyta Suleiman, Illya Podolsky, and Lina Perekhoda. "Synthesis of new 4,4'-(1H-1,2,3-triazole)-bis(1H-pyrazol-5-ols) and prospects for their study as potential antitumor agents." ScienceRise: Pharmaceutical Science, no. 2 (54) (April 30, 2025): 49–58. https://doi.org/10.15587/2519-4852.2025.327116.

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The aim of our work is to develop an efficient synthesis of a series of novel 4,4'-(1H-1,2,3-triazol)bis(1H-pyrazol-5-ols), synthesize the target substances, and perform molecular docking focusing on the interaction of the synthesized compounds with the active sites of known cytostatics targeting various stages of oncogenesis. Materials and methods. The structure and purity of the obtained substances were confirmed by 1H NMR spectroscopy, 13C NMR spectroscopy and LC/MS. Docking studies were performed for the substances synthesized using Autodock 4.2 software. Results and discussion. A series o

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22

Vu, T. N. A., A. N. Utenyshev, N. A. Polyanskaya, V. A. Nguyen, and O. V. Kovalchukova. "Synthesis, Molecular Structure, and Spectral Characteristics of Lead(II) Complexes with 1,5-Dimethyl-4-[2-(3-methyl-5-oxo-1-phenyl-1,5-dihydro-4H-pyrazol-4-ylidene)hydrazinyl]-2-phenyl-1,2-dihydro-3H-pyrazol-3-one." Russian Journal of General Chemistry 90, no. 11 (2020): 2128–33. http://dx.doi.org/10.1134/s1070363220110171.

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23

Jarvinen, G. D., R. R. Ryan, B. F. Smith, and J. M. Ritchey. "Preparation and crystal and molecular structures of uranyl complexes of 4-benzoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-thione and the pyrazol-3-one analogue." Inorganica Chimica Acta 129, no. 1 (1987): 139–48. http://dx.doi.org/10.1016/s0020-1693(00)85916-2.

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24

Teja, H. B., H. S. Bhojya Naik, P. H. Amith Nayak, and M. C. Prabhakara. "Study of Photophysico-chemical and Antimicrobial Photodynamic Properties of Visible Light Active Azometal(II) Complexes." Asian Journal of Chemistry 33, no. 8 (2021): 1709–17. http://dx.doi.org/10.14233/ajchem.2021.23178.

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The Co(II) and Mn(II) complexes with octahedral geometries of the type [Co(L)2(H2O)2] and [Mn(L)2(H2O)2] were synthesized and characterized by elemental analysis, FT-IR, UV-visible spectra, powered XRD and photoluminescence. Both metal(II) complexes were prepared with 4-[(Z)-(8-hydroxyquinolin-5-yl)diazenyl]-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one. The complexes were evaluated for in vitro antimicrobial photodynamic activity against Gram-positive, Gram-negative bacteria and fungi. The cell inhibition rate was found to be 80-96%. in vitro Cytotoxic studies were performed for the synt

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25

Tanak, Hasan, Ayşen Ağar, and Metin Yavuz. "Combined experimental and computational modeling studies on 4-[(2-hydroxy-3-methylbenzylidene) amino]-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one." International Journal of Quantum Chemistry 111, no. 9 (2011): 2123–36. http://dx.doi.org/10.1002/qua.22504.

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26

E., M. Jincy, K. Rejimon P., and K. Muraleedharan Nair M. "SYNTHESIS, CHARACTERIZATION AND ANTIMICROBIAL STUDIES OF SOME LANTHANIDE (III) COMPLEXES WITH A TRIDENTATE ONO DONOR SCHIFF BASE LIGAND." International Journal of Applied and Advanced Scientific Research 2, no. 2 (2017): 246–51. https://doi.org/10.5281/zenodo.1066089.

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Some new lanthanide(III) complexes- La(III), Ce(III), Pr(III) and Nd(III) have been synthesised from Schiff base ligand 4-{[(2-hydroxyphenyl)imino]methyl}-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one (L<sub>1</sub>) whose precursors are 4-antipyrine carboxaldehyde   and 2-aminophenol. The metal to ligand ratio (1:2) and the general formula [Ln(L<sub>1</sub>)<sub>2</sub>(NO<sub>3</sub>)<sub>2</sub>]NO<sub>3</sub> were established by elemental analysis, conductivity measurements, spectral techniques such as IR, UV-Visible, <sup>1</sup>H NMR as well as magnetic susceptibility meas

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27

Cerchiaro, Giselle, Ana M. Da Costa Ferreira, Aline B. Teixeira, et al. "Synthesis and crystal structure of 2,4-dihydro-4-[(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)imino]-5-methyl-2-phenyl-3H-pyrazol-3-one and its copper(II) complex." Polyhedron 25, no. 10 (2006): 2055–64. http://dx.doi.org/10.1016/j.poly.2006.01.002.

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28

Rukk, N. S., R. S. Shamsiev, D. V. Albov, and S. N. Mudretsova. "Structural characterization of hydrogen bonding for antipyrine derivatives: Single-crystal X-ray diffraction and theoretical studies." Fine Chemical Technologies 16, no. 2 (2021): 113–37. http://dx.doi.org/10.32362/2410-6593-2021-16-2-113-124.

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Objectives. The paper is devoted to the crystal structure characterization of 5-methyl-2-phenyl4H-pyrazol-3-one (compound I) and 2-(4-chlorophenyl)-5-methyl-4H-pyrazol-3-one (compound II).Methods. Single-crystal X-ray diffraction studies and theoretical calculations: Density functional theory and quantum theory of atoms in molecules.Results. In the solid state, the crystal structure of compound I is characterized by the alternation of OH and NH tautomers connected via O–H---O and N–H---N hydrogen bonds. For compound II, the existence of chains built from the NH monomers via hydrogen bonding ca

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29

Kimura, Michio. "Crystal and Molecular Structure of 3-Pyrazolone Derivatives. III. 5-Amino-2-phenyl-4-(9H-thioxanthen-9-yl)-1,2-dihydro-3H-pyrazol-3-one." Bulletin of the Chemical Society of Japan 59, no. 1 (1986): 121–25. http://dx.doi.org/10.1246/bcsj.59.121.

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30

HÖKELEK, Tuncer, Zeynel KILIÇ, and Zeliha HAYVALI. "Crystal Structure of 1,5-Dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one-4-[(1E)-(aminomethylidenyl)]-5'-hydroxy-benzo-15-crown-5." Analytical Sciences 18, no. 4 (2002): 495–96. http://dx.doi.org/10.2116/analsci.18.495.

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31

Rajamanickam, Ramachandran, Senthan Sivakolunthu, and Jayanthi Sampathkumar. "Synthesis, crystal structure, Hirshfeld surface, DFT and docking studies of 4-[(5‑hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)(phenyl)methyl]-5-methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one." Journal of Molecular Structure 1252 (March 2022): 132170. http://dx.doi.org/10.1016/j.molstruc.2021.132170.

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32

Philip, Surya, Soosan Thomas та K. Mohanan. "Synthesis, fluorescent studies, antioxidative and α-amylase inhibitory activity evaluation of some lanthanide(III) complexes". Journal of the Serbian Chemical Society 83, № 5 (2018): 561–74. http://dx.doi.org/10.2298/jsc180918010p.

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A novel heterocyclic ligand, viz. 1,2-dihydro-1,5-dimethyl-4-[[1-2- -oxo-2H-1-benzopyran-3-yl)ethylidene]amino]-2-phenyl-3H-pyrazol-3-one, was prepared by condensing 3-acetylcoumarin with 4-aminoantipyrine. This ligand is versatile in forming complexes with lanthanum(III), praseodymium(III), samarium(III), gadolinium(III) and dysprosium(III) ions. The ligand and the metal complexes were characterized through various physicochemical and spectral studies. The spectral studies revealed that the ligand is coordinated to the metal ion in a bidentate fashion, through the azomethine nitrogen and the

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33

Chavda, Mukesh M., Manoj F. Dhaduk, and Jatin M. Upadhyay. "Synthesis, characterization and biological study of some new substituted pyrazolo[3,4-d] thiazolo[3,2-a] pyrimidine derivatives." Current Chemistry Letters 12, no. 4 (2023): 831–38. http://dx.doi.org/10.5267/j.ccl.2023.3.010.

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Fused pyrimidines play an imperative role in our life due to their biological importance in the struggle of microorganisms. A series of 4-aryl-3-methyl-1-phenyl-1,4,6,7-tetrahydropyrazolo[3,4-d] thiazolo[3,2-a]pyrimidine (4a-j) were synthesized by cyclization of 3-methyl-1-phenyl-4-aryl-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-d]pyrimidine-6-thiones (3a-j) with 1,2-dibromoethane in presence of anhydrous potassium carbonate. Earlier, compounds (3a-j) were synthesized by the condensation of 5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one (2), different substituted benzaldehyde and thiourea with catalyt

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34

Pang, Haixia. "Crystal structure of catena-poly[dibromido-{μ2-1,5-dimethyl-2-phenyl-4-((pyridin-4-ylmethylene)amino)-1,2-dihydro-3H-pyrazol-3-one-κ2N:O}zinc(II)], C34H32Br4N8O2Zn2". Zeitschrift für Kristallographie - New Crystal Structures 234, № 3 (2019): 559–61. http://dx.doi.org/10.1515/ncrs-2018-0559.

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AbstractC34H32Br4N8O2Zn2, triclinic, P1̄ (no. 2), a = 11.441(2) Å, b = 13.422(2) Å, c = 14.370(3) Å, α = 101.129(3)°, β = 99.587(2)°, γ = 114.972(3)°, V = 1885.0(6) Å3, Z = 2, Rgt(F) = 0.0510, wRref(F2) = 0.1775, T = 298(2) K.

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35

Anila Raj, S., V. G. Vidya, V. Preethi, and V. G. Viju Kumar. "Single crystal XRD and DFT investigation of 1,5-dimethyl-4-[(2-oxo-1,2-diphenylethylidene) amino]-2-phenyl-1,2-dihydro-3H-pyrazol-3-one." Results in Chemistry 4 (January 2022): 100665. http://dx.doi.org/10.1016/j.rechem.2022.100665.

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Ahsan, Mohamed Jawed, Jeyabalan Govinda Samy, Chandra Bhushan Jain, Kunduri Rajeswar Dutt, Habibullah Khalilullah, and Md Shivli Nomani. "Discovery of novel antitubercular 1,5-dimethyl-2-phenyl-4-([5-(arylamino)-1,3,4-oxadiazol-2-yl]methylamino)-1,2-dihydro-3H-pyrazol-3-one analogues." Bioorganic & Medicinal Chemistry Letters 22, no. 2 (2012): 969–72. http://dx.doi.org/10.1016/j.bmcl.2011.12.014.

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Asrondkar, Ashish, Vibhav Valsangkar, Vrushali Patil, A. S. Bobade, and A. S. Chowdhary. "Synthesis of substituted 4-(3-chloro-2-oxo-4-phenylazetidin-1-yl)- 1, 5-dimethyl-2-phenyl-1, 2-dihydro-3H-pyrazol-3-one with Green Chemistry approach." IOSR Journal of Applied Chemistry 7, no. 4 (2014): 04–09. http://dx.doi.org/10.9790/5736-07410409.

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38

Zhang, Hong, Xiaoqing Zou, Qiran Feng, Baoming Xu та Haixia Pang. "Crystal structure of catena-poly[diiodido-(μ2-1,5-dimethyl-2-phenyl-4-((pyridin-3-ylmethylene)amino)-1,2-dihydro-3H-pyrazol-3-one-κ2N:O)zinc(II)], C17H16I2N4OZn". Zeitschrift für Kristallographie - New Crystal Structures 233, № 6 (2018): 1061–62. http://dx.doi.org/10.1515/ncrs-2018-0171.

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Chornous, V. A., A. N. Grozav, O. Ya Mel’nik, V. V. Pirozhenko, and M. V. Vovk. "Polyfunctional imidazoles: X. Synthesis of 4-chloro-5-(2-nitroalkenyl)-1H-imidazoles and their reaction with 5-methyl-2,4-dihydro-3H-pyrazol-3-one." Russian Journal of Organic Chemistry 51, no. 4 (2015): 534–40. http://dx.doi.org/10.1134/s1070428015040132.

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Cherayath, Sr, J. Alice, and Chathakudam P. Prabhakaran. "Palladium(II) complexes of Schiff bases derived from 5-amino-2,4-(1H, 3H)pyrimidinedione (5-aminouracil) and 1,2-dihydro-1,5-dimethyl-2-phenyl-4-amino-3H-pyrazol-3-one." Transition Metal Chemistry 15, no. 6 (1990): 449–53. http://dx.doi.org/10.1007/bf01040774.

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Linhart, Petr. "Extraction of promethium complex with 4-benzoyl-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one into Freon 113 and its mixtures with benzene." Collection of Czechoslovak Chemical Communications 56, no. 10 (1991): 2096–99. http://dx.doi.org/10.1135/cccc19912096.

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A study of the dependence of distribution of Pm(III) between aqueous phase ( perchlorate medium) and Freon 113 (or a Freon 113-benzene mixture 2 : 1) on pH and pA has shown that the complex PmA3 is extracted into the organic phase with the extraction constant log Kex = -4.35. The stability constant βn of the complex PmA3 has been calculated by the Leden method.

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42

Pang, Haixia, Xiaoqing Zou, Defu Tao, Jun Li, Jiahui Zhang та Hong Zhang. "Crystal structure of catena-poly[dichlorido-(μ2-1,5-dimethyl-2-phenyl-4-((pyridin-4-ylmethylene)amino)-1,2-dihydro-3H-pyrazol-3-one-κ2N:O)cobalt(II)] – methanol (1/1), C18H20Cl2CoN4O2". Zeitschrift für Kristallographie - New Crystal Structures 234, № 1 (2018): 125–26. http://dx.doi.org/10.1515/ncrs-2018-0222.

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43

Tao, Defu, Haixia Pang, Chuanqun Hu та Qiang Tang. "Crystal structure of catena-poly[(μ2-1,5-dimethyl-2-phenyl-4-((pyridin-4-ylmethylene)amino)-1,2-dihydro-3H-pyrazol-3-one-κ2N:O)-bis(nitrato-κ1O)zinc(II)], C17H16N6O7Zn". Zeitschrift für Kristallographie - New Crystal Structures 235, № 3 (2020): 601–3. http://dx.doi.org/10.1515/ncrs-2019-0844.

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44

Polikovskiy, Trofim, Vladislav Korshunov, Mikhail Metlin, et al. "Influence of Ligand Environment Stoichiometry on NIR-Luminescence Efficiency of Sm3+, Pr3+ and Nd3+ Ions Coordination Compounds." Molecules 28, no. 15 (2023): 5892. http://dx.doi.org/10.3390/molecules28155892.

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Six new complexes of the ligand HQcy (-4-(cyclohexanecarbonyl)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one) and Ln3+ ions with emission in the near-infrared (Nd3+) or visible and near-infrared (Sm3+, Pr3+) spectral regions were synthesized and characterized using various methods, including single crystal X-ray diffraction. The study demonstrated that both tris complexes [LnQcy3(H2O)(EtOH)] and tetrakis-acids [H3O][LnQcy4] can be synthesized by varying the synthetic conditions. The photochemical properties of the complexes were investigated experimentally and theoretically using various mole

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45

Konshina, Dzhamilya N., Ida A. Lupanova, and Valery V. Konshin. "Novel Organomineral Material Containing an Acylpyrazolone Functionalized Ionic Liquid for the Extraction and Separation of Rare Earth Elements." Chemistry 6, no. 5 (2024): 1133–45. http://dx.doi.org/10.3390/chemistry6050066.

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4-Acylpyrazolones are important ligands in analytical chemistry and technologies used for the separation and concentration of various metals. We have proposed a novel method for obtaining a material that consists of covalently immobilized functionalized ionic liquid on the surface of a mineral carrier featuring a coordination-active fragment of 4-acylpyrazolone. For its synthesis, we have introduced a strategy based on the quaternization of surface azolyl groups from 3-(1H-imidazol-1-yl)propyl silica with an alkylating reagent containing a 4-acylpyrazolone motif-4-(6-bromohexanoyl)-5-methyl-2-

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Azev, Yu A., I. S. Kovalev, A. V. Mekhaev, et al. "Synthesis, thermal transformations, and mass spectrometric fragmentation of 4,4'-[1,2-bis(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)ethane-1,2-diyl]-bis(5-methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one)." Chemistry of Heterocyclic Compounds 49, no. 4 (2013): 545–50. http://dx.doi.org/10.1007/s10593-013-1280-7.

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Huang, Ling, Duan Qiu, Ai-Guo Zhong, and Yang Shen. "Crystal structure of 4-{[(1E)-(3,5-diiodo-2-hydroxyphenyl)methylene]- amino}-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one — benzene (1:0.5), C18H15I2N3O2 · 0.5C6H6." Zeitschrift für Kristallographie - New Crystal Structures 225, no. 3 (2010): 591–92. http://dx.doi.org/10.1524/ncrs.2010.0258.

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Smith, Barbara F., Gordon D. Jarvinen, Marianne M. Jones, and P. Jeffrey Hay. "THE SYNTHESIS AND ACTINIDE AND LANTHANIDE COMPLEXATION OF“ SOFT” DONOR LIGANDS: COMPARISON BETWEEN 4-BENZOYL-2,4-DIHYDRO-5-METHYL-2-PHENYL-3H-PYRAZOL-3-THIONE ( HBMPPT) AND 4-THIOBENZOYL-2,4-DIHYDRO-5-METHYL-2-PHENYL-3H-PYRAZOL-3-ONE ( HTBMPP) WITH TRI-n-OCTYLPHOSPHINE OXIDE (TOPO) SYNERGIST FOR Am( III) AND Eu( III) EXTRACTION." Solvent Extraction and Ion Exchange 7, no. 5 (1989): 749–65. http://dx.doi.org/10.1080/07360298908962335.

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Athira, L. S., S. Balachandran, J. Annaraj, and E. Abel Noelson. "Molecular structure, spectroscopic, solvatochromic, dyeing performance and biological evaluations of heterocyclic azo dye, 4-[(E)-(4-hydroxy-2-methylphenyl)diazenyl]-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one." Journal of Molecular Structure 1195 (November 2019): 556–69. http://dx.doi.org/10.1016/j.molstruc.2019.06.007.

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Saranya, B., and M. Gowri. "Synthesis, Characterization, DFT study and Molecular Docking of (Z)-4-((2-hydroxy-3-methoxy benzylidene)amino)-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one and its Metal Complexes." Journal of Molecular Structure 1250 (February 2022): 131674. http://dx.doi.org/10.1016/j.molstruc.2021.131674.

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