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Dive into the research topics where Mirza Arfan Yawer is active.

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Featured researches published by Mirza Arfan Yawer.


Angewandte Chemie | 2015

A Bambusuril Macrocycle that Binds Anions in Water with High Affinity and Selectivity

Mirza Arfan Yawer; Václav Havel; Vladimir Sindelar

Synthetic receptors that function in water are important for the qualitative and quantitative detection of anions, which may act as pollutants in the environment or play important roles in biological processes. Neutral receptors are particularly appealing because they are often more selective than positively charged receptors; however, their affinity towards anions in pure water is only in range of 1-10(3)  L mol(-1) . The anion-templated synthesis of a water-soluble bambusuril derivative is shown to be an outstanding receptor for various inorganic anions in pure water, with association constants of up to 10(7)  L mol(-1) . Furthermore, the macrocycle discriminates between anions with unprecedented selectivity (up to 500 000-fold). We anticipate that the combination of remarkable affinity and selectivity of this macrocycle will enable the efficient detection and isolation of diverse anions in aqueous solutions, which is not possible with current supramolecular systems.


Bioorganic & Medicinal Chemistry | 2008

Hetero-Diels-Alder reaction of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with arylsulfonylcyanides. Synthesis and antimicrobial activity of 4-hydroxy-2-(arylsulfonyl)pyridines.

Ibrar Hussain; Mirza Arfan Yawer; Michael Lalk; Ulrike Lindequist; Alexander Villinger; Christine Fischer; Peter Langer

Abstract Hetero-Diels–Alder reactions of 1,3-bis(silyloxy)-1,3-butadienes with arylsulfonylcyanides afforded a variety of 4-hydroxy-2-(arylsulfonyl)pyridines. Several derivatives show antimicrobial activity against Gram-positive bacteria.


Chemistry: A European Journal | 2017

pH Control on the Sequential Uptake and Release of Organic Cations by Cucurbit[7]uril

Lukas Mikulu; Romana Michalicová; Vivian Iglesias; Mirza Arfan Yawer; Angel E. Kaifer; Premysl Lubal; Vladimir Sindelar

Cucurbit[7]uril (CB7) is a macrocycle with the ability to form the most stable supramolecular complexes in water ever reported for an artificial receptor. Its use for the design of advanced functional materials is, however, very limited because there is no example of a fully reversible CB7 based supramolecular complex enabling repetitious dissociation/association controlled by external stimuli. We report the synthesis of a new ferrocene amino acid that forms with CB7 a 1:1 inclusion complex that is stable in submicromolar concentration at low pH but dissociates at high pH. This reversible process was used for the sequential uptake and release of bispyridinium and antraquinone guests by CB7, which is controlled by adjusting the pH of the solution.


Zeitschrift für Naturforschung B | 2013

Synthesis of Functionalized Acetophenones by Formal [3+3] Cyclocondensations of 1,3-Bis(silyloxy)-1,3-butadienes with 3-Alkoxyand 3-Silyloxy-2-acetyl-2-en-1-ones

Rüdiger Dede; Abdolmajid Riahi; Mohanad Shkoor; Mirza Arfan Yawer; Ibrar Hussain; Nazken Kelzhanova; Zharylkasyn A. Abilov; Abiodun Falodun; Helmar Görls; Peter Langer

The TiCl4-mediated cyclization of 1,3-bis(silyloxy)-1,3-butadienes with 2-acetyl-1-silyloxybut-1- en-3-one and 3-acetyl-4-silyloxypent-3-en-2-one, readily available from 3-(formyl)acetylacetone and 3-(acetyl)acetylacetone (triacetylmethane), afforded a variety of functionalized acetophenones Graphical Abstract Synthesis of Functionalized Acetophenones by Formal [3+3] Cyclocondensations of 1,3-Bis(silyloxy)-1,3-butadienes with 3-Alkoxyand 3-Silyloxy-2-acetyl-2-en-1-ones


Chemistry: A European Journal | 2017

Supramolecular storage and controlled photorelease of an oxidizing agent using a bambusuril macrocycle

Edoardo Torti; Václav Havel; Mirza Arfan Yawer; Lucie Ludvíková; Michal Babiak; Petr Klán; Vladimir Sindelar

The oxidizing ability of peroxodisulfate upon complexation inside the Bambusuril macrocycle cavity is inhibited. This dianionic agent can be released on demand from its stable 1:1 complex in water (log Ka =6.9 m-1 ) by addition of a more strongly bound anion, such as iodide (log Ka =7.1 m-1 ), which can also be delivered in situ upon irradiation from a 4-hydroxyphenacyl iodide derivative with spatial and temporal precision. The oxidizing properties of peroxodisulfate ions liberated from the complex recover and can take part in subsequent chemical transformations.


Journal of Organic Chemistry | 2007

Synthesis of Dibenzo[b,d]pyran-6-ones Based on [3 + 3] Cyclizations of 1,3-Bis(silyl enol ethers) with 3-Silyloxy-2-en-1-ones

Ibrar Hussain; Van Thi Hong Nguyen; Mirza Arfan Yawer; Tuan Thanh Dang; Christine Fischer; Helmut Reinke; Peter Langer


Advanced Synthesis & Catalysis | 2016

Synthesis of Biaryls via Ligand-Free Suzuki-Miyaura Cross-Coupling Reactions: A Review of Homogeneous and Heterogeneous Catalytic Developments

Ibrar Hussain; Jaworski Capricho; Mirza Arfan Yawer


Chemical Communications | 2015

Real-time analysis of multiple anion mixtures in aqueous media using a single receptor.

Václav Havel; Mirza Arfan Yawer; Vladimir Sindelar


European Journal of Organic Chemistry | 2008

Regioselective Synthesis of Fluorinated Phenols, Biaryls, 6H-Benzo[c]chromen-6-ones and Fluorenones Based on Formal [3+3] Cyclizations of 1,3-Bis(silyl enol ethers)

Ibrar Hussain; Mirza Arfan Yawer; Matthias Lau; Thomas Pundt; Christine Fischer; Helmar Görls; Peter Langer


Tetrahedron | 2009

First synthesis of functionalized 5-aryl-3-(trifluoromethyl)phenols by regioselective [3+3] cyclocondensations of 1,3-bis(silyloxy)-1,3-butadienes with 3-aryl-3-silyloxy-1-trifluoromethyl-2-en-1-ones

Stefan Büttner; Abdolmajid Riahi; Ibrar Hussain; Mirza Arfan Yawer; Mathias Lubbe; Alexander Villinger; Helmut Reinke; Christine Fischer; Peter Langer

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