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Dive into the research topics where Leonid A. Shundrin is active.

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Featured researches published by Leonid A. Shundrin.


Molecules | 2016

Fused 1,2,3-Dithiazoles: Convenient Synthesis, Structural Characterization, and Electrochemical Properties

Lidia S. Konstantinova; Ilia V. Baranovsky; Irina G. Irtegova; Irina Yu. Bagryanskaya; Leonid A. Shundrin; Andrey V. Zibarev; Oleg A. Rakitin

A new general protocol for synthesis of fused 1,2,3-dithiazoles by the reaction of cyclic oximes with S2Cl2 and pyridine in acetonitrile has been developed. The target 1,2,3-dithiazoles fused with various carbocycles, such as indene, naphthalenone, cyclohexadienone, cyclopentadiene, and benzoannulene, were selectively obtained in low to high yields. In most cases, the hetero ring-closure was accompanied by chlorination of the carbocyclic moieties. With naphthalenone derivatives, a novel dithiazole rearrangement (15→13) featuring unexpected movement of the dithiazole ring from α- to β-position, with respect to keto group, was discovered. Molecular structure of 4-chloro-5H-naphtho[1,2-d][1,2,3]dithiazol-5-one 13 was confirmed by single-crystal X-ray diffraction. Electrochemical properties of 13 were studied by cyclic voltammetry and a complex behavior was observed, most likely including hydrodechlorination at a low potential.


Chemistry: A European Journal | 2018

Radical Anions, Radical-Anion Salts and Anionic Complexes of 2,1,3-Benzochalcogenadiazoles (S, Se, Te)

Nikolay A. Pushkarevsky; Elena A. Chulanova; Leonid A. Shundrin; A. I. Smolentsev; G. E. Sal'nikov; Elena A. Pritchina; Alexander M. Genaev; Irina G. Irtegova; Irina Yu. Bagryanskaya; Sergey N. Konchenko; Nina P. Gritsan; Jens Beckmann; Andrey V. Zibarev

By means of cyclic voltammetry (CV) and DFT calculations, it was found that the electron-acceptor ability of 2,1,3-benzochalcogenadiazoles 1-3 (chalcogen: S, Se, and Te, respectively) increases with increasing atomic number of the chalcogen. This trend is nontrivial, since it contradicts the electronegativity and atomic electron affinity of the chalcogens. In contrast to radical anions (RAs) [1].- and [2].- , RA [3].- was not detected by EPR spectroscopy under CV conditions. Chemical reduction of 1-3 was performed and new thermally stable RA salts [K(THF)]+ [2].- (8) and [K(18-crown-6)]+ [2].- (9) were isolated in addition to known salt [K(THF)]+ [1].- (7). On contact with air, RAs [1].- and [2].- underwent fast decomposition in solution with the formation of anions [ECN]- , which were isolated in the form of salts [K(18-crown-6)]+ [ECN]- (10, E=S; 11, E=Se). In the case of 3, RA [3].- was detected by EPR spectroscopy as the first representative of tellurium-nitrogen π-heterocyclic RAs but not isolated. Instead, salt [K(18-crown-6)]+ 2 [3-Te2 ]2- (12) featuring a new anionic complex with coordinate Te-Te bond was obtained. On contact with air, salt 12 transformed into salt [K(18-crown-6)]+ 2 [3-Te4 -3]2- (13) containing an anionic complex with two coordinate Te-Te bonds. The structures of 8-13 were confirmed by XRD, and the nature of the Te-Te coordinate bond in [3-Te2 ]2- and [3-Te4 -3]2- was studied by DFT calculations and QTAIM analysis.


Russian Journal of Organic Chemistry | 2010

Synthesis and electrochemical Reduction of 2,2′-diaryl-5,5,5′,5′-tetramethyl-3,3′-bi(pyrrol-3-ylidene)-4,4′(5H,5′H)-dione 1,1′-dioxides

I. A. Khalfina; N. V. Vasil’eva; Irina G. Irtegova; Leonid A. Shundrin; V. A. Reznikov

Abstract2,2′-Diaryl-5,5,5′,5′-tetramethyl-3,3′-bi(pyrrol-3-ylidene)-4,4′(5H,5′H)-dione 1,1′-dioxides containing a carboxy, alkoxycarbonyl, or carbamoyl group in the para position of one or both benzene rings were synthesized. These compounds may be regarded as cyclic dinitrones with conjugated C=C bond. Mild aminolysis of carboxy groups in the title compounds may be used to introduce dinitrone fragments into oligonucleotide or polypeptide structures. Electrochemical reduction of the resulting amides involves reversible oneelectron transfer in the first step at a near-zero potential, which makes it possible to use the title compounds as electrochemically active labels in applied bioorganic electrochemistry.


Journal of Physical Organic Chemistry | 2010

Redox properties and radical anions of fluorinated 2,1,3‐benzothia(selena)diazoles and related compounds

Nadezhda V. Vasilieva; Irina G. Irtegova; Nina P. Gritsan; Anton V. Lonchakov; Alexander Yu. Makarov; Leonid A. Shundrin; Andrey V. Zibarev


Tetrahedron | 2014

1,2,5-Thiadiazole 2-oxides: selective synthesis, structural characterization, and electrochemical properties

Lidia S. Konstantinova; Ekaterina A. Knyazeva; Natalia V. Obruchnikova; Nadezhda V. Vasilieva; Irina G. Irtegova; Yulia V. Nelyubina; Irina Yu. Bagryanskaya; Leonid A. Shundrin; Zhanna Yu. Sosnovskaya; Andrey V. Zibarev; Oleg A. Rakitin


Tetrahedron Letters | 2016

Benzoquinone and naphthoquinone based redox-active labels for electrochemical detection of modified oligonucleotides on Au electrodes

Leonid A. Shundrin; Irina G. Irtegova; Nadezhda V. Vasilieva; Irina A. Khalfina


European Journal of Organic Chemistry | 2014

Preparation of Diversely Substituted Triarylmethyl Radicals by the Quenching of Tris(2,3,5,6-tetrathiaaryl)methyl Cations with C-, N-, P-, and S-Nucleophiles

Victor M. Tormyshev; Olga Yu. Rogozhnikova; Michael K. Bowman; Dmitry V. Trukhin; Tatiana I. Troitskaya; Vladimir G. Vasiliev; Leonid A. Shundrin; Howard J. Halpern


European Journal of Organic Chemistry | 2004

A New Class of Enehydroxylamino Ketones − (R)-2-(1-Hydroxy-4,4,5,5-tetraalkylimidazolidin-2-ylidene)ethanones: Synthesis and Reactions

V. A. Reznikov; Galina I. Roshchupkina; Dmitrii G. Mazhukin; P. A. Petrov; Sergei A. Popov; S. V. Fokin; G. V. Romanenko; Tatjana V. Rybalova; Yuri V. Gatilov; Yuri G. Shvedenkov; Irina G. Irtegova; Leonid A. Shundrin; Victor I. Ovcharenko


Mendeleev Communications | 2007

Redox properties and radical ions of 1,3λ4δ2,2,4-benzodithiadiazines in the hydrocarbon and fluorocarbon series

Nadezhda V. Vasilieva; Irina G. Irtegova; Nina P. Gritsan; Leonid A. Shundrin; Anton V. Lonchakov; Alexander Yu. Makarov; Andrey V. Zibarev


Mendeleev Communications | 2013

Redox properties and radical anions of 2-substituted thioxanthen-9-ones and their 2-methyl S-oxide derivatives

Nadezhda V. Vasilieva; Irina G. Irtegova; Vladimir A. Loskutov; Leonid A. Shundrin

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Irina G. Irtegova

Russian Academy of Sciences

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Andrey V. Zibarev

Russian Academy of Sciences

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V. A. Reznikov

Russian Academy of Sciences

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Nina P. Gritsan

Russian Academy of Sciences

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Pavel A. Avrorov

Russian Academy of Sciences

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Anton V. Lonchakov

Russian Academy of Sciences

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