Relevant bibliographies by topics / Bisurées

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters

Academic literature on the topic 'Bisurées'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Bisurées"

1

Ranganathan, Darshan, C. Lakshmi, V. Haridas, and M. Gopikumar. "Designer cyclopeptides for self-assembled tubular structures." Pure and Applied Chemistry 72, no. 3 (January 1, 2000): 365–72. http://dx.doi.org/10.1351/pac200072030365.

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A simple design strategy for a facile and direct entry into hydrogen-bonded peptide nanotubes is delineated with polymethylene-bridged cystine-based macrocycles. The key feature of the design is the placement of a pair of self-complementary hydrogen-bonding (NH–CO or NH–CO–NH) groups at almost opposite poles of the ring. A large variety of cyclobisamides and bisureas prepared in a single step by direct condensation of commercially available 1,ω-alkane dicarbonyl dichloride or diisocyanate with either cystine diOMe or its extended bispeptide were examined by X-ray crystallography and shown to possess an inherent property of self-assembling into hydrogen-bonded, open-ended, hollow tubular structures. The totally hydrophobic interior of the cyclobisamide tubes creates a micro environment capable of solubilizing highly lipophilic substances in water. The cyclic bisurea tubes are demonstrated to act as excellent receptors for selective binding to 1,ω-alkane dicarboxylates. The scope of the design is extended to the creation of tubular structures by stacking of rings through aromatic π-π interactions.
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Watt, Michelle M., Jeffrey M. Engle, Kurtis C. Fairley, Timothy E. Robitshek, Michael M. Haley, and Darren W. Johnson. "“Off-on” aggregation-based fluorescent sensor for the detection of chloride in water." Organic & Biomolecular Chemistry 13, no. 14 (2015): 4266–70. http://dx.doi.org/10.1039/c4ob02409e.

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3

Akyev, D., O. V. Lebedev, T. S. Pivina, V. A. Shlyapochnikov, and L. I. Khmel'nitskii. "Electronic structure of bicyclic bisureas." Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 38, no. 2 (February 1989): 400–401. http://dx.doi.org/10.1007/bf00953637.

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Akyev, D., O. V. Lebedev, T. S. Pivina, and L. I. Khmel'nitskii. "Spatial structure of bicyclic bisureas." Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 38, no. 9 (September 1989): 1860–63. http://dx.doi.org/10.1007/bf00957778.

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5

Tanaka, Koichi, Naoki Daikawa, and Shigeru Ohba. "Novel Bisurea Host Compounds." Journal of Chemical Research 2002, no. 11 (November 2002): 579–81. http://dx.doi.org/10.3184/030823402103170853.

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New host molecules, 4,4′-bis(dimethylamino-urea)diphenylmethane (1) and its derivatives (2 and 3), are reported. These hosts are shown to give inclusion complex crystals with a wide variety of organic guest molecules with high selectivity. The crystal structure of 1:2 inclusion complex of 1 with THF has been determined from X-ray crystal structure analysis. The cyclic N–H...O intermolecular hydrogen bonds between host molecules were found to form columns for accommodation of the guest molecules.
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6

Kollenz, Gert, Ralf Smounig, Ferdinand Belaj, David Kvaskoff, and Curt Wentrup. "Molecular cleft or tweezer compounds derived from trioxabicyclo[3.3.1]nonadiene diisocyanate and diacid dichloride." Beilstein Journal of Organic Chemistry 11 (January 2, 2015): 1–8. http://dx.doi.org/10.3762/bjoc.11.1.

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The structures of two derivatives of the bisdioxine diisocyanate 1, the bisurea 4 and the biscarbamate 5, are established by X-ray crystallography and DFT calculations. These compounds possess endo,endo structures, in the case of the bisurea 4 with two nearly parallel pendant chains. The X-ray structures are reproduced very well by DFT calculations. Similar endo,endo conformations are calculated for the bisamide crown ether derivatives 7, where two proximate and nearly parallel crown ether units endow the molecules with a claw-like molecular cleft or tweezer structure as evidenced by an enhanced ability to extract some alkali, alkaline earth and rare earth metal ions.
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7

Shu, Xi, Yu Fan, Shoujian Li, Yongdong Jin, Chuanqin Xia, and Chao Huang. "Anion binding and fluoride ion induced conformational changes in bisurea receptors." New Journal of Chemistry 44, no. 5 (2020): 2033–45. http://dx.doi.org/10.1039/c9nj05785d.

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8

Park, Eun Bit, and Kyu-Sung Jeong. "Chloride transport activities of trans- and cis-amide-linked bisureas." Chemical Communications 51, no. 44 (2015): 9197–200. http://dx.doi.org/10.1039/c5cc02757h.

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9

Ito, Suguru, Manami Okuno, and Masatoshi Asami. "Differentiation of enantiomeric anions by NMR spectroscopy with chiral bisurea receptors." Organic & Biomolecular Chemistry 16, no. 2 (2018): 213–22. http://dx.doi.org/10.1039/c7ob02318a.

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10

Gavette, Jesse V., Christina M. Klug, Lev N. Zakharov, Matthew P. Shores, Michael M. Haley, and Darren W. Johnson. "Intramolecular N–H⋯Cl hydrogen bonds in the outer coordination sphere of a bipyridyl bisurea-based ligand stabilize a tetrahedral FeLCl2 complex." Chem. Commun. 50, no. 54 (2014): 7173–75. http://dx.doi.org/10.1039/c4cc02297a.

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Dissertations / Theses on the topic "Bisurées"

1

Lortie, Frédéric. "Synthèse et carctérisation en solution d'assemblages supramoléculaires d'urées substituées." Paris 12, 2001. http://www.theses.fr/2001PA120027.

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Des urées disustituées ont été choisies pour construire des polymères supramoléculaires qui peuvent être définis comme des assemblages de monomères liés par des liaisons non covalentes. Les monourées s'associent par liaison hydrogène et forment des rubans. Les substituants aikyle ou aryle contrôlent la solubilité et le degré d'association en solution comme le montrent à la fois la modélisation moléculaire et des mesures de viscosimétrie, de RMN et de spectroscopie infrarouge. L'influence de la nature du solvant et de la température a été étudiée. L'addition d'une deuxième fonction urée renforce l'association comme l'indiquent les valeurs accrues de la viscosité des solutions de bisurées. Dans le cas de la bisurée 2,4-bis(2- éthylhexyluréido)toluène, l'association intermoléculaire est de nature coopérative. La diffusion des neutrons aux petits angles montre que cette bisurée forme des fils bimoléculaires, rigides et longs à faible concentration. Le comportement en solution est en accord avec les théories de Cates sur les polymères réversibles. Des limiteurs de chaînes ont été synthétisés afin de contrôler les masses des polymères supramoléculaires de la bisurée. L'utilisation d'un de ces limiteurs a permis l'application de la loi de Mark-Houwink en viscosimétrie et la détermination des masses des assemblages par diffusion de la lumière d'abord en présence de limiteur. Des mesures de rhéologie montrent que les solutions de bisurées sont conformes au modèle de Maxwell à faible fréquence, indiquant que la relaxation est dominée par un processus de scission-recombinaison des chaînes. A plus forte concentration, les solutions forment des gels physiques dont les points de réticulation sont constitués par des défauts rencontrés le long de la chaîne du polymère supramoléculaire.
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2

Aresu, Emanuele. "Synthesis of novel bridged-pentanidiums and their performance in asymmetric phase-transfer catalysis." Diss., 2021. http://hdl.handle.net/10754/668730.

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Abstract: Chiral phase-transfer catalysis (CPTC) is an efficient industrial process used to produce enantiomerically pure chemicals, such as agrochemicals, active pharmaceuticals ingredients (API), and monomers.1 CPTC has been applied successfully in various organic reactions with many advantages,2–6 such as mild reaction conditions, high product yields, elimination of hazardous or expensive reagents and solvents, and large- scale asymmetric productions.7 In the last decade, a chiral sp2-quaternary ammonium salt, pentanidium, reported by Tan et al. in 2011, has represented a breakthrough in this field.8 Since pentanidium catalysts have a high impact on asymmetric synthesis and are highly amenable to modification, a new class of bridged-pentanidium catalysts is discussed in this dissertation. The first part focuses on the retrosynthesis of chiral bridged-pentanidium catalysts and how they might be differently functionalized, starting the synthesis from commercial chiral diamines. As a proof-of-concept, a non-chiral bridged-pentanidium was synthesized and fully characterized. The reaction conditions were optimized for each step, particularly the critical seven-membered ring closure reaction, which proved that the retrosynthetic pathway was reliable. Next more sophisticated structures of chiral bridged-pentanidium catalysts were developed. These synthetic pathways involved the discovery of new compounds, such as chiral tertiary bisthioureas, chiral tetraamides, and chiral bisureas. Thus, various chiral bridged-pentanidium catalysts bearing various functional groups and counterions to tune their reactivity were produced. In the second part, the reactivity of chiral bridged-pentanidium catalysts was assessed in various asymmetric reactions. In particular, direct alkylation and Michael addition reactions were applied to synthesize natural and unnatural amino acids. Then, an asymmetric organocascade Michael-Michael reaction for the synthesis of chiral trisubstituted indanes was investigated. Lastly, additional control experiments involving various substrates and reagents were performed. The third part of this work investigated enantioselective induction through computational studies, including density functional theory (DFT), topographic steric maps, and topographic electrostatic maps.9 These studies characterized the properties of the previously synthesized chiral bridged-pentanidium catalysts and revealed how their enantioselectivity is affected by the structure of the catalyst. Finally, the structures and asymmetric induction of the novel chiral bridged-pentanidium catalysts were compared with those of open-pentanidium catalysts reported in the literature.
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Book chapters on the topic "Bisurées"

1

Philp, Douglas. "The Assembly of New Materials Incorporating Macropolycyclic Bisurea Hosts." In Magnetism: A Supramolecular Function, 53–64. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-015-8707-5_4.

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