Relevant bibliographies by topics / Bis-guanidine

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Academic literature on the topic 'Bis-guanidine'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Bis-guanidine"

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Strassl, Florian, Alexander Hoffmann, Benjamin Grimm-Lebsanft, Dieter Rukser, Florian Biebl, Mai Tran, Fabian Metz, Michael Rübhausen, and Sonja Herres-Pawlis. "Fluorescent Bis(guanidine) Copper Complexes as Precursors for Hydroxylation Catalysis." Inorganics 6, no. 4 (October 20, 2018): 114. http://dx.doi.org/10.3390/inorganics6040114.

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Bis(guanidine) copper complexes are known for their ability to activate dioxygen. Unfortunately, until now, no bis(guanidine) copper-dioxygen adduct has been able to transfer oxygen to substrates. Using an aromatic backbone, fluorescence properties can be added to the copper(I) complex which renders them useful for later reaction monitoring. The novel bis(guanidine) ligand DMEG2tol stabilizes copper(I) and copper(II) complexes (characterized by single crystal X-ray diffraction, IR spectroscopy, and mass spectrometry) and, after oxygen activation, bis(µ-oxido) dicopper(III) complexes which have been characterized by low-temperature UV/Vis and Raman spectroscopy. These bis(guanidine) stabilized bis(µ-oxido) complexes are able to mediate tyrosinase-like hydroxylation activity as first examples of bis(guanidine) stabilized complexes. The experimental study is accompanied by density functional theory calculations which highlight the special role of the different guanidine donors.
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Elmes, BC, G. Holan, GT Wernert, and DA Winkler. "The Synthesis of Bisguanidinoalkanes and Guanidinoalkanes, N- or N'-Substituted With Pyrimidines, as Analogues of Chlorhexidine." Australian Journal of Chemistry 49, no. 5 (1996): 573. http://dx.doi.org/10.1071/ch9960573.

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A series of N,N???- alkanediylbis [N?-(5-halopyrimidin-2-yl)guanidine] salts has been synthesized along with N,N???-(trans-cyclohexane-1,4-diyl) bis [N'-(5-chloropyrimidin-2-yl)guanidine], N,N???-(cis-cyclohexane-1,4-diyl) bis [N?-(5-chloropyrimidin-2-yl)guanidine] dihydrochloride and N-(cis-4-amino-cyclohexan-1-yl)-N'-(5-chloropyrimidin-2-yl)guanidine dihydrochloride . Furthermore, a series of N-(alkan-1-yl)-N?-(5-chloropyrimidin-2yl)guanidine hydrochlorides and N-(6-aminohexan-1-yl)-N?-(5-chloropyrimidin-2-yl)guanidine dihydrochloride were synthesized. This series of compounds was prepared by displacement reactions of 2-methylsulfonylpyrimidines with bisguanidinoalkanes or by condensation of 5-chloro-2-cyanoaminopyrimidine (5-chloropyrimidin-2-ylcyanamide) with alkylamines .
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Sudha, L., K. Subramanian, J. Senthil Selvan, Th Steiner, G. Koellner, K. Ramdas, and N. Srinivasan. "1,2-Bis(2,6-diethylphenyl)-3,3-(oxydiethyl)guanidine." Acta Crystallographica Section C Crystal Structure Communications 53, no. 1 (January 15, 1997): 88–90. http://dx.doi.org/10.1107/s0108270196011080.

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Rösch, Andreas, Simon H. F. Schreiner, Philipp Schüler, Helmar Görls, and Robert Kretschmer. "Magnesium bis(amidinate) and bis(guanidinate) complexes: impact of the ligand backbone and bridging groups on the coordination behaviour." Dalton Transactions 49, no. 37 (2020): 13072–82. http://dx.doi.org/10.1039/d0dt01923b.

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By dealing with various bis(amidine)s or bis(guanidine)s and different magnesium sources, we got a full house of homoleptic complexes. However, the joker card showing a heteroleptic complex is waiting to be used.
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5

Koskinen, Jere T. "Experimental and Computational Studies on Aminoguanidine Free Base, Monocation and Dication. Part III: Proton Affinities of Guanidine, Aminoguanidine and Glyoxal Bis(amidinohydrazone)." Zeitschrift für Naturforschung B 53, no. 3 (March 1, 1998): 386–92. http://dx.doi.org/10.1515/znb-1998-0320.

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Abstract The structures of glyoxal bis(amidinohydrazone) (GBG) free base and glyoxal bis(amidi-nohydrazonium) monocation and dication were calculated quantum chemically by using the density functional hybrid method B3-LYP with the standard basis set 6 -31 G (d). Proton affinities calculated from these data are 246.4 kcal/mol for the free base and 176.0 kcal/mol for the monocation. The proton affinities of guanidine free base (246.2 kcal/mol), aminogua­nidine free base (242.9 kcal/mol), aminoguanidinium monocation (88.6 kcal/mol) were calcu­lated for reference. The B3-LYP functional overestimates the proton affinities for all the species studied. For example, for guanidine the proton affinity at the M P2/6-31G (d) level is 238.3 kcal/mol, the experimental reference value being 233 kcal/mol. However, from the B3-LYP values it can be concluded that in the gas phase all the three bases are nearly equally basic. On the other hand, it is known that in aqueous solution guanidine is a much stronger base than aminoguanidine and glyoxal bis(amidinohydrazone). The results are discussed from the point of view of molecular size, shape and symmetry, and hydrogen bonding in solution.
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Li, Cai, Kwok-Wa Ip, Wai-Lun Man, Dan Song, Ming-Liang He, Shek-Man Yiu, Tai-Chu Lau, and Guangyu Zhu. "Cytotoxic (salen)ruthenium(iii) anticancer complexes exhibit different modes of cell death directed by axial ligands." Chemical Science 8, no. 10 (2017): 6865–70. http://dx.doi.org/10.1039/c7sc02205k.

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Wittmann, Harald, Andrea Schorm, and Jörg Sundermeyer. "Chelatliganden auf Basis peralkylierter Bis- und Tris-Guanidine." Zeitschrift für anorganische und allgemeine Chemie 626, no. 7 (July 2000): 1583–90. http://dx.doi.org/10.1002/1521-3749(200007)626:7<1583::aid-zaac1583>3.0.co;2-3.

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Said, Muhammad, Sadia Rehman, Muhammad Ikram, Hizbullah Khan, and Carola Schulzke. "Synthesis and crystal structure analyses of tri-substituted guanidine-based copper(II) complexes." Zeitschrift für Naturforschung B 76, no. 3-4 (March 22, 2021): 193–99. http://dx.doi.org/10.1515/znb-2020-0155.

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Abstract Three guanidine-derived tri-substituted ligands viz. N-pivaloyl-N′,N″-bis-(2-methoxyphenyl)guanidine (L1), N-pivaloyl-N′-(2-methoxyphenyl)-N″-phenylguanidine (L2) and N-pivaloyl-N′-(2-methoxyphenyl)-N″-(2-tolyl)guanidine (L3) were reacted with Cu(II) acetate to produce the corresponding complexes. The significance of the substituent on N″ for the resulting molecular structures and their packing in the solid state has been studied with respect to the structural specifics of the corresponding Cu(II) complexes. The key characteristic of the guanidine-based metal complexation with Cu(II) is the formation of an essentially square planar core with an N2O2 donor set. As an exception, in the complex of L1, the substituent’s methoxy moiety also interacts with the Cu(II) center to generate a square-pyramidal geometry. The hydroxyl groups of the imidic acid tautomeric forms of L1–L3, in addition to N″, are also bonded to Cu(II) in all three complexes rather than the nitrogen donor of the guanidine motif.
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9

Santos Vieira, Ines dos, and Sonja Herres-Pawlis. "Novel Guanidine-Quinoline Hybrid Ligands and the Application of their Zinc Complexes in Lactide Polymerisation." Zeitschrift für Naturforschung B 67, no. 4 (April 1, 2012): 320–30. http://dx.doi.org/10.1515/znb-2012-0405.

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The syntheses of the three new guanidine-quinoline hybrid ligands TMGmqu, DMEGmqu and TMGtbqu are reported. Zinc chlorido and triflato complexes with these ligands were obtained and structurally characterised by X-ray crystallography. In the chlorido complexes the zinc atom is coordinated by two chlorido ligands and the bidentate guanidine ligand in a distorted tetrahedron. Using zinc triflate, tetrahedral bis(chelate) complexes are formed, and the triflate anions serve only for charge compensation. All reported complexes show activity in the polymerisation of rac-lactide, with the chlorido complexes only showing a poor activity. With the bis(chelate) triflato complexes a high polymerisation activity with a slight heterotactic bias was observed. Kinetic studies reveal a firstorder chain growth reaction for the lactide polymerisation with all complexes.
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Singh, Prabal, S. Yugandar, S. Kumar, H. Ila, and H. Junjappa. "Synthesis of Novel Five- and Six-Membered Ferrocene-Containing Heterocycles and Heteroaromatics via Cyclocondensation of 1-Ferro­cenyl-3,3-bis(methylthio)prop-2-en-1-one with Various Bifunctional Nucleophiles." Synthesis 49, no. 12 (March 10, 2017): 2700–2710. http://dx.doi.org/10.1055/s-0036-1588966.

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Synthesis and reactions of 1-ferrocenyl-3,3-bis(methylthio)prop-2-en-1-one as a versatile 1,3-bielectrophilic synthon leading to a range of novel ferrocene-containing five- and six-membered heterocycles and heteroaromatics has been reported. Thus its cyclocondensation with various bifunctional heteronucleophiles, such as hydrazine­, phenylhydrazine, hydroxylamine, guanidine, and amidine, affords­ a range of ferrocene-substituted pyrazoles, oxazoles, and pyrimidines in highly regioselective manner. Synthesis of few ferrocenyl-substituted pyridines and thiophenes has also been described. Similarly cycloaromatization of this ferrocene-substituted α-oxoketene dithioacetal with anions generated from (het)arylacetonitriles provides a facile entry to ferrocene-substituted heteroaromatics in good yields. Synthesis of a few 2-ferrocenylvinyl-substituted heterocycles, such as pyrazoles, isoxazoles, and pyrimidines, via cyclocondensation of a novel 5-ferrocenyl-1,1-bis(methylthio)penta-1,4-dien-3-one with phenylhydrazine, hydroxylamine, and guanidine has also been reported.
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Dissertations / Theses on the topic "Bis-guanidine"

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Degardin, Mélissa. "Synthèse et activités antipaludiques de bis-alkylamidines N-monosubstituées, bis-alkylguanidines et de leurs bioprécurseurs de type amidoxime et O-dérivés." Montpellier 2, 2009. http://www.theses.fr/2009MON20165.

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Des stratégies prodrogues amidoxime et oxadiazolone ont été appliquées à de nouvelles drogues bis-alkylamidines N-monosubstituées que nous avons synthétisées selon une nouvelle stratégie divergente basée sur l'utilisation de la bis-alkyloxadiazolone N-substituée comme intermédiaire de synthèse. Des dérivés N-alkylsulfonyles de bis-alkylamidoximes ont été développés dans le but d'obtenir des structures stables in vitro tout en conservant de fortes activités orales. Enfin, de nouvelles drogues bis-alkylguanidines ont été synthétisées ainsi que leurs bioprécurseurs N-hydroxyguanidines, aminooxadiazolones et iminooxadiazolidinones. Les activités antipaludiques in vitro et in vivo des composés obtenus ont été évaluées
Amidoxime and oxadiazolone prodrug strategies have been applied to new N-monosubstituted bis-alkylamidine drugs which were synthesised by a new divergent strategy based on the use of the N-substitued bis-alkyloxadiazolone as an intermediate. Bis-alkylamidoxime N-alkylsulfonyles derivatives have been developed to obtain in vitro stable structures preserving potent oral activities. Finally, new bis-alkylguanidine drugs were synthesised as well as their bioprecursors N-hydroxyguanidines, aminooxadiazolones and iminooxadiazolidinones. In vitro and in vivo antiplasmodial activities of the obtained compounds were evaluated
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Book chapters on the topic "Bis-guanidine"

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Leow, Dasheng, and Choon-Hong Tan. "Chiral Bicyclic Guanidine, Bis-Guanidinium, Pentanidium and Related Organocatalysts." In Topics in Heterocyclic Chemistry, 129–55. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/7081_2015_175.

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Taber, Douglass F. "Organic Functional Group Protection and Deprotection." In Organic Synthesis. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199965724.003.0016.

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Corey R. J. Stephenson of Boston University devised (Chem. Commun. 2011, 47, 5040) a protocol using visible light for removing the PMB group from 1 to give 2. John F. Hartwig, now at the University of California, Berkeley, developed (Science 2011, 332, 439) a Ni catalyst for the cleavage of the durable aryl ether of 3 to give 4. Mark S. Taylor of the University of Toronto devised (J. Am. Chem. Soc. 2011, 133, 3724) the catalyst 6, which selectively mediated esterifi cation of 5 to 7. Jean-Marie Beau of the Université Paris-Sud added (Chem. Commun. 2011, 47, 2146) Et3 SiH following the Fe-catalyzed deprotection-protection of 8, resulting in clean conversion to the bis ether 9. Mahmood Tajbakhsh of the University of Mazandaran showed (Tetrahedron Lett. 2011, 52, 1260) that guanidine HCl catalyzed the conversion of 10 to 11. Stephen W. Wright of Pfizer/Groton established (Tetrahedron Lett. 2011, 52, 3171) that the new urethane protecting group of 12, stable to many conditions, could be deprotected to 13 under conditions that spared even a Boc group. Matthias Beller of the Leibniz-Institute for Catalysis protected (Chem. Commun. 2011, 47, 2152) the amine 14 as the readily hydrolyzed imidazole 16. Sentaro Okamoto of Kanagawa University found (Org. Lett. 2011, 13, 2626) a simple reagent combination for the removal of the sometimes reluctant sulfonamide from 17. Jordi Burés and Jaume Vilarrasa of the Universitat de Barcelona removed (Angew. Chem. Int. Ed. 2011, 50, 3275) the oxime from 19 by Au-catalyzed exchange with 20. Pengfei Wang of the University of Alabama, Birmingham, designed (J. Org. Chem. 2011, 76, 2040) a range of photochemically removable protecting groups for aldehydes and ketones. Rafael Robles of the University of Granada selectively protected (J. Org. Chem. 2011, 76, 2277) the diol 24 using the reagent created by the activation of 25. Berit Olofsson of Stockholm University prepared (Org. Lett. 2011, 13, 3462) the phenyl ester 28 by exposing 27 to the diaryl iodonium triflate. Kannoth Manheri Muraleedharan of the Indian Institute of Technology, Madras, selectively (Org. Lett. 2011, 13, 1932) esterified 29 to 30 with catalytic SmCl3.
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