Academic literature on the topic '2-pyrazoles'

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Journal articles on the topic "2-pyrazoles"

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Deacon, Glen B., Peter C. Junk, and Aron Urbatsch. "Lanthanoid and Alkaline Earth Complexes Involving New Substituted Pyrazolates." Australian Journal of Chemistry 65, no. 7 (2012): 802. http://dx.doi.org/10.1071/ch12069.

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From the pyrazoles 3,5-di-(2′-furanyl)pyrazole (fu2pzH), 3-phenyl-5-(2′-thienyl)pyrazole (PhtpzH) and 3-(2′-furanyl)-5-(2′′-naphthyl)pyrazole (funappzH), a range of alkaline earth and lanthanoid pyrazolate complexes has been prepared by redox transmetallation/protolysis reactions between free metals, Hg(C6F5)2 and the pyrazoles, by reaction of I2‐activated metals with the pyrazoles, and in one case by a similar reaction of unactivated metal, in the donor solvents tetrahydrofuran (thf) and 1,2-dimethoxyethane (dme). Thus the divalent [Ca(Phtpz)2(thf)4], [Ba(Phtpz)2(thf)4] and [Ca(funappz)2(thf)
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Andicsová, Anita, Angelika Lásiková, Marek Fronc, Jozef Kožíšek, and Daniel Végh. "3-(2-Heteroaryl)-pyrazolotetrazoles – a subunits for losartan-like structures." Acta Chimica Slovaca 5, no. 2 (2012): 220–24. http://dx.doi.org/10.2478/v10188-012-0033-z.

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Abstract A modification of biphenylyltetrazole moiety of Losartan (A) by 3-(2-heteroaryl)-pyrazolotetrazole (B) is described. Ketone semicarbazones react with two moles of phosphorus oxychloride-dimethylformamide with the formation of 3-substituted pyrazol-4-carbaldehydes. The transformations of 3-substituted pyrazole-4- carboxaldehydes to 3-substituted pyrazole-4-nitriles were carried out by reaction of hydroxylamine in DMFA. The prepared cyano pyrazoles were converted to tetrazoles by heating with trimethylsilylazide and dibuthyltinoxide in toluene.
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Gill, Agagia, Udo R. Werz, and Gerhard Maas. "N-vinylation and N-allylation of 3,5-disubstituted pyrazoles by N–H insertion of vinylcarbenoids." Zeitschrift für Naturforschung B 70, no. 10 (2015): 747–56. http://dx.doi.org/10.1515/znb-2015-0115.

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AbstractA vinylcarbenoid approach toward N-functionalization of NH-pyrazoles is presented. The rhodium(II)-catalyzed reaction of methyl styryl-diazoacetate (1) or dimethyl 2-diazoglutaconate (3) with 3,5-disubstituted pyrazoles gave products of carbenoid N–H insertion in high combined yields, although regioselectivity issues posed by the pyrazole or the vinylcarbenoid moiety as well as positional and configurational isomerism concerning the C,C double bond of the latter led to product mixtures. The ambident reactivity of the vinylcarbenoid derived from 1 could be steered by the catalyst: while
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Jansa, Josef, Ramona Schmidt, Ashenafi Damtew Mamuye, et al. "Synthesis of tetrasubstituted pyrazoles containing pyridinyl substituents." Beilstein Journal of Organic Chemistry 13 (May 12, 2017): 895–902. http://dx.doi.org/10.3762/bjoc.13.90.

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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 1,3,5-trisubstituted pyrazoles. Iodination at the 4-position of the pyrazole nucleus by treatment with I2/HIO3 gives the appropriate 4-iodopyrazoles which served as starting materials for different cross-coupling reactions. Finally, Negishi cross-coupling employing organozinc halides and Pd catalysts turned out to be the method of choice to obtain
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Frampton, Christopher S., Michael W. Majchrzak, and John Warkentin. "Sense of sequential 1,5-sigmatropic rearrangements of dimethyl-3,3-dialkyl-3H-pyrazole-4,5-dicarboxylates. Crystal and molecular structures of two dimethyl-4,5-dialkyl-1H-pyrazole-1,3-dicarboxylates." Canadian Journal of Chemistry 69, no. 3 (1991): 373–78. http://dx.doi.org/10.1139/v91-057.

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3,3-Dialkyl-3H-pyrazole-4,5-dicarboxylic acid dimethyl esters (4), obtained by cycloaddition of R1R2C=N+=N− (R1 = R2 = CH3; R1 = CH3, R2 = CH2CH3) to CH3O2CC≡CCO2CH3, rearrange thermally by 1,5-sigmatropic alkyl shifts to both N and C. The latter rearrangement is followed by two successive 1,5-sigmatropic shifts of a methoxycarbonyl group. Final products of the threefold rearrangement were shown to be 4,5-dialkyl-1H-pyrazole-1,3-dicarboxylic acid dimethyl esters (6), rather than the isomeric 3,4-dialkyl-1H-pyrazole-1,5-dicarboxylic acid dimethyl esters (7), by means of single crystal X-ray dif
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Ding, Zhengwei, Qitao Tan, Mingchun Gao, and Bin Xu. "Copper-catalyzed aerobic cascade cycloamination and acyloxylation: a direct approach to 4-acyloxy-1H-pyrazoles." Organic & Biomolecular Chemistry 13, no. 16 (2015): 4642–46. http://dx.doi.org/10.1039/c5ob00409h.

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An efficient copper-catalyzed regioselective olefinic C(sp<sup>2</sup>)–H bond cycloamination and acyloxylation was developed to give acyloxylated pyrazoles under mild conditions, which combines the formation of the pyrazole skeleton and installation of an acyloxyl group in a single step.
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Lévai, Albert, Artur M. S. Silva, José A. S. Cavaleiro, José Elguero, Ibon Alkorta, and József Jekő. "Synthesis of 4-Aryl-3(5)-(2-hydroxyphenyl)pyrazoles by Reaction of Isoflavones and their 4-Thio Analogues with Hydrazine Derivatives." Australian Journal of Chemistry 60, no. 12 (2007): 905. http://dx.doi.org/10.1071/ch07268.

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4-Aryl-3(5)-2-(hydroxyphenyl)pyrazoles have been prepared by the reaction of isoflavones and their 4-thio analogues with hydrazine hydrate and phenylhydrazine in hot pyridine. The reaction mechanism for the formation of these pyrazoles is discussed. All the new compounds have been fully characterized by NMR spectroscopy. In [D6]DMSO, a 1H NMR study allows observation of the presence of both pyrazole annular tautomers, due to the presence of intramolecular hydrogen bonds in each tautomer (OH···N and NH···O). Theoretical calculations have been carried out on tautomers and conformers of compounds
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Alsayari, Abdulrhman, Abdullatif Bin Muhsinah, Yahya I. Asiri, et al. "Arylhydrazono/Aryldiazenyl Pyrazoles: Green One-Pot Solvent-Free Synthesis and Anticancer Evaluation." Letters in Organic Chemistry 17, no. 10 (2020): 772–78. http://dx.doi.org/10.2174/1570178617666200320104923.

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The aim of this study was to synthesize and evaluate the biological activity of pyrazole derivatives, in particular, to perform a “greener” one-pot synthesis using a solvent-free method as an alternative strategy for synthesizing hydrazono/diazenyl-pyridine-pyrazole hybrid molecules with potential anticancer activity. Effective treatment for all types of cancers is still a long way in the future due to the severe adverse drug reactions and drug resistance associated with current drugs. Therefore, there is a pressing need to develop safer and more effective anticancer agents. In this context, s
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Bertolasi, Valerio, Paola Gilli, Valeria Ferretti, Gastone Gilli, and Cristina Fernàndez-Castaño. "Self-assembly of NH-pyrazoles via intermolecular N—H...N hydrogen bonds." Acta Crystallographica Section B Structural Science 55, no. 6 (1999): 985–93. http://dx.doi.org/10.1107/s0108768199004966.

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The crystal structures of two NH-pyrazole derivatives forming intermolecular N—H...N hydrogen bonds are reported: 5-methyl-4-(3-methylpyrazol-5-yl)pyrazol-3-ol, C8H10N4O (P1), and 3-methyl-5-dihydro-1H-naphtho[1,2-d]pyrazole hemihydrochloride, C12H12N2.-C12H13N_{2}^{+}.Cl− (P2). 26 other structures are surveyed in order to obtain a deeper insight into the ways NH-pyrazoles self-assemble by means of intermolecular N—H...N hydrogen bonds in molecular crystals. A limited number of compounds form chains or dimers via homonuclear N+—H...N positive-charge-assisted hydrogen bonds, typical of proton s
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Muhammad, Zeinab A., Fatimah Alshehrei, Mohie E. M. Zayed, Thoraya A. Farghaly, and Magda A. Abdallah. "Synthesis of Novel Bis-pyrazole Derivatives as Antimicrobial Agents." Mini-Reviews in Medicinal Chemistry 19, no. 15 (2019): 1276–90. http://dx.doi.org/10.2174/1389557519666190313095545.

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Background: bis-heterocycles especially those containing pyrazole moiety display much better antibacterial activity than mono heterocycles. Objective: Herein, we synthesised a series of new bis-pyrazoles and investigated their antimicrobial agents. Methods: A novel series of bis-pyrazole derivatives have been synthesized in good yield by coupling reaction of cyanoacetic acid 4-[(2-cyano-acetyl)-hydrazonomethyl]-benzylidene-hydrazide with a number of diazonium salts of aromatic amines in DMF in the presence of NaOH. Refluxing of the produced hydrazones with hydrazine-hydrate in ethanolic soluti
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Dissertations / Theses on the topic "2-pyrazoles"

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Grosse, Sandrine. "Imidazo[1, 2-b]pyrazoles, imidazo[1, 2-a]imidazoles : synthèse, fonctionnalisation et évaluation biologique." Thesis, Orléans, 2013. http://www.theses.fr/2013ORLE2056.

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Les imidazo[1,2-b]pyrazoles tout comme les imidazo[1,2-a]imidazoles sont des entités présentant diverses applications intéressantes notamment dans le domaine pharmacologique. Cependant, malgré ce potentiel, ces structures hétérobicycliques ont été, jusqu’à ce jour, relativement peu étudiées tant au niveau de leur préparation que de leur fonctionnalisation. De ce fait, ces travaux de thèse ont pour objet la mise au point de nouvelles voies d’accès à ces systèmes bicycliques et ce, au départ de substrats facilement accessibles. Des stratégies de fonctionnalisation de ces charpentes moléculaires
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Desalegn, Nebiyou. "Kinetic Studies Of The Thermolysis Of 3-Halogenated-4,5-Dihydro-3h-Pyrazoles." Digital Archive @ GSU, 2005. http://digitalarchive.gsu.edu/chemistry_theses/1.

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3-Chloro-4,4,5-trimethyl-3,5-diphenyl-4,5-dihydro-3H-pyrazole (3b) and 3-bromo-4,4,5-trimethyl-3,5-diphenyl-4,5-dihydro-3H-pyrazole (3c) were prepared for the thermolysis project. The thermal decompositions of 3b and 3c were monitored using 1H NMR spectroscopy. Plots of ln (% starting material) vs. time (sec) were linear for at least two half lives and the first order rate constants were determined over at least a 30o temperature range. The relative reactivity was found to be 3c > 3b. The activation parameters determined for the thermal decomposition of the pyrazoline at 150oC were found to be
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Verma, Astha. "Small Core Heterocyclic Carbamates and Carboxamides: Resistance-breaking Acetylcholinesterase Inhibitors Targeting the Malaria Mosquito, Anopheles gambiae." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/64294.

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Malaria is one of the deadliest diseases known to mankind. In 2010, 219 million cases were reported, and 666,000 deaths were attributed to this disease. In the past, pyrethroid-treated mosquito nets have shown efficacy in reducing malaria transmission in many malaria endemic regions. However, an upsurge in the mosquito population that is resistant to pyrethroids threatens to compromise the efficacy of pyrethroid-treated bed nets. In an effort to develop another class of insecticide with a different mode of action, we have explored three classes of five membered heterocyclic carbamates (isoxazo
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Moreira, Dayse das Neves. "Síntese de pirazóis e desenvolvimento de novos líquidos iônicos derivados de componentes farmacologicamente ativos." Universidade Federal de Santa Maria, 2011. http://repositorio.ufsm.br/handle/1/4214.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The synthesis of two series of N-substituted pyrazoles from the cyclocondensation reaction of β-enaminones ([R1C(O)C(R2)=CHN(Me2)], where R1 = Me, C6H5, 3-MeOC6H4, 4-Me-C6H4, 4-MeO-C6H4, 4-F-C6H4, 4-Cl-C6H4, 4-Br-C6H4, 4-O2N-C6H4, fur-2-il, thien-2-il; R2 = H, 2-MeO-C6H4) and 2-hydroxyethylhydrazine or 1-pentafluorophenylhydrazine was demonstrated. The reactions were performed in five ionic liquids ([BMIM][BF4], [BMIM][Br], [BMIM][OH], [HMIM][HSO4] e [BPy][BF4]) with different physical and chemical properties to establish the
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Truong, Phong Minh. "Hexa-aryl/alkylsubstituted Cyclopropanes." Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/chemistry_theses/2.

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A series of penta-aryl/alkyl-1-(toluene-4-sulfonyl)-4,5-dihydro-1H-pyrazole 5a-c was synthesized by addition of methyllithium or phenylllithium followed by trapping the nitrogen anion intermediate with tosyl-fluoride to cyclic azines 2a,b. Addition of methyllithium or phenyllithium to 5a-c generated a series of hexa-aryl/alkylsubstituted-4,5-dihydro-3H-pyrazoles 6a-c. Neat thermolysis of hexa-aryl/alkylsubstituted-4,5-dihydro-3H-pyrazoles 6a-c at 200◦C produced hexa-aryl/alkylsubstituted cyclopropanes 7a-c in high yield.
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Motson, Graham Robert. "Coordination chemistry of 3-(2'-pyridyl) pyrazole derivative ligands." Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391153.

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Böhnisch, Torben. "C2-Symmetric Pyrazole-Bridged Ligands and Their Application in Asymmetric Transition-Metal Catalysis." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2015. http://hdl.handle.net/11858/00-1735-0000-0028-876A-6.

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Wong, Joanne. "Designing New Heterometallic [2 x 2] Grids using Pyrazolate-bridged Ligands." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://hdl.handle.net/21.11130/00-1735-0000-0005-1323-E.

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Sens, Llorca Cristina. "New mono- and dinuclear ruthenium complexes containing the 3,5-bis(2-pyridyl)pyrazole ligand. Synthesis, characterization and applications." Doctoral thesis, Universitat de Girona, 2005. http://hdl.handle.net/10803/8034.

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Se han sintetizado dos nuevos complejos mononucleares de Ru, con formula [RuCl2(Hbpp)(dmso)2], a partir de la reacción entre [RuCl2(dmso)4] y Hbpp (3,5-bis(2-piridil)pirazola). El hecho que sólo tres de los seis posibles estereoisómeros se obtengan a partir de esta reacción, se ha racionalizado en base a factores estructurales y electrónicos. Estos complejos se han caracterizado de forma estructural, espectroscópica y electroquímica. En acetonitrilo en medio básico, el isómero trans,cis-[RuCl2(Hbpp)(dmso)2] da lugar a procesos de isomerización de enlace de un ligando dmso cuando el Ru(II) se o
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Meunier, Andreas. "Cyclooxygenase-2 inhibitors and knee prosthesis surgery." Doctoral thesis, Linköping : Department of Clinical and Experimental Medicine, Linköping University, 2008. http://www.bibl.liu.se/liupubl/disp/disp2008/med1077s.pdf.

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Book chapters on the topic "2-pyrazoles"

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Bodanszky, Miklos, and Agnes Bodanszky. "1-Guanyl-3,5-dimethyl-pyrazole Nitrate [1, 2]." In The Practice of Peptide Synthesis. Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85055-4_38.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of iron(II) complex with 1,3-bis(pyradin-2-yl)-pyrazole." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_36.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of 2-(3, 5-dimethyl-pyrazole-1-yl) benzothiazole complex of copper(II) chloride." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_199.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of 2-(3, 5-dimethyl-pyrazole-1-yl) benzothiazole complex of copper(II) bromide." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_200.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of 2-(3, 5-dimethyl-pyrazole-1-yl) benzothiazole complex of copper(II) nitrate." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_201.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of 2-(3, 5-dimethyl-pyrazole-1-yl) benzothiazole complex of copper(II) sulphate." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_202.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of 2-(3, 5-dimethyl-pyrazole-1-yl) benzothiazole complex of copper(II) perchlorate." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_203.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of mixed bridged, dinuclear copper(II) chloride complex with 3-(6-methylpyridin-2-yl)-5-(pyridin-2-yl) pyrazole." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_111.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of mixed bridged, dinuclear copper(II) bromide complex with 3-(6-methylpyridin-2-yl)-5-(pyridin-2-yl)pyrazole." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_112.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of mixed bridged, dinuclear copper(II) chloride complex with dinucleating, 3, 5-bis(pyridin-2-yl)pyrazole." In Magnetic Properties of Paramagnetic Compounds. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_109.

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Conference papers on the topic "2-pyrazoles"

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Khatri, Taslimahemad Talab, Aadil Khursheed, and Pushpendra Kumar. "Water mediated synthesis of pyrano[2, 3-c]pyrazoles using L-histidine as an effective catalyst." In RECENT ADVANCES IN FUNDAMENTAL AND APPLIED SCIENCES: RAFAS2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4990359.

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Navarini, Jussara, Helio G. Bonacorso, Carson W. Wiethan, et al. "Synthesis of New 5-Trifluoromethyl-3-alkyl[aryl(heteroaryl)]-4- (2-benzyl-3-hydroxycyclohex-2-enone-2-yl)-1H-pyrazoles by a Ring-Opening Reaction." In 14th Brazilian Meeting on Organic Synthesis. Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-14bmos-r0009-1.

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Galarraga, Elier, Neudo Urdaneta, and Julio Herrera. "In vitro Anti-leishmanial and Anti-trypanosomal Activity of Hydrazones, Pyrazoles, Pyrazolo[1,5-a]pyrimidines and Pyrazolo[3,4-b]pyridines Synthesized from 6-Substituted-3-formylchromones." In 2nd International Electronic Conference on Medicinal Chemistry. MDPI, 2016. http://dx.doi.org/10.3390/ecmc-2-a003.

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Shardin, Rosidah, Law Kung Pui, Bohari M. Yamin, and Mohammad B. Kassim. "Formation of a dinuclear copper(II) complex through the cleavage of CN bond of 1-benzoyl-3-(pyridin-2-yl)-1H-pyrazole." In THE 2014 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2014 Postgraduate Colloquium. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4895217.

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