1
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Semenov AV, Baykov SV, Soldatova NS, Geyl KK, Ivanov DM, Frontera A, Boyarskiy VP, Postnikov PS, Kukushkin VY. Noncovalent Chelation by Halogen Bonding in the Design of Metal-Containing Arrays: Assembly of Double σ-Hole Donating Halolium with Cu I-Containing O,O-Donors. Inorg Chem 2023; 62:6128-6137. [PMID: 37000904 DOI: 10.1021/acs.inorgchem.3c00229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
Five new copper(I) complexes─composed of the paired dibenzohalolium and [CuL2]- (L = 1,2,4-oxadiazolate) counterions in which O,O-atoms of the anion are simultaneously linked to the halogen atom─were generated and isolated as the solid via the three-component reaction between [Cu(MeCN)4](BF4), sodium 1,2,4-oxadiazolates, and dibenzohalolium triflates (or trifluoroacetates). This reaction is different from the previously reported CuI-catalyzed arylation of 1,2,4-oxadiazolones by diaryliodonium salts. Inspection of the solid-state X-ray structures of the complexes revealed the strong three-center X···O,O (X = Br, I) halogen bonding occurred between the oxadiazolate moieties and dibenzohalolium cation. According to performed theoretical calculations, this noncovalent interaction (or noncovalent chelation) was recognized as the main force in the stabilization of the copper(I) complexes. An explanation for the different behavior of complexes, which provide either chelate or nonchelate binding, is based on the occurrence of additional -CH3···π interactions, which were also quantified.
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2
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Adjieufack AI, Moto Ongagna J, Pouyewo Tenambo A, Opoku E, Mbouombouo IN. How a Chromium Tricarbonyl Complex Catalyzes the [3 + 2] Cycloaddition Reaction of N-Substituted Phenylnitrones with Styrene: A Molecular Electron Density Theory Analysis. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Abel Idrice Adjieufack
- Laboratory of Theoretical Chemistry (LCT) and Namur Institute of Structured Matter (NISM), University of Namur, Rue de Bruxelles, 61, Namur B-5000, Belgium
- Physical and Theoretical Chemistry Laboratory, University of Yaoundé I, P.O. Box 812, Yaoundé 00237, Cameroon
- Computational Chemistry Laboratory, High Teacher Training College, University of Yaoundé I, P.O. Box 47, Yaoundé 00000, Cameroon
| | - Jean Moto Ongagna
- Computational and Theoretical Chemistry Unit, Department of Chemistry, Faculty of Science, University of Douala, P.O. Box 24157, Douala 00000, Cameroon
| | - Ariane Pouyewo Tenambo
- Physical and Theoretical Chemistry Laboratory, University of Yaoundé I, P.O. Box 812, Yaoundé 00237, Cameroon
- Computational Chemistry Laboratory, High Teacher Training College, University of Yaoundé I, P.O. Box 47, Yaoundé 00000, Cameroon
| | - Ernest Opoku
- Department of Molecular Quantum Chemistry, Nesvard Institute of Molecular Sciences, Accra 00000, Ghana
| | - Ibrahim Ndassa Mbouombouo
- Computational Chemistry Laboratory, High Teacher Training College, University of Yaoundé I, P.O. Box 47, Yaoundé 00000, Cameroon
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3
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Formation and Intramolecular Capture of α-Imino Gold Carbenoids in the Au(I)-Catalyzed [3 + 2] Reaction of Anthranils, 1,2,4-Oxadiazoles, and 4,5-Dihydro-1,2,4-Oxadiazoles with Ynamides. Catalysts 2022. [DOI: 10.3390/catal12080915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
α-Imino gold carbenoid species have been recognized as key intermediates in a plethora of processes involving gold-activated alkynes. Here, we explored the pathways of the Au(I)-catalyzed [3 + 2] reaction between the mild nucleophiles: anthranil, 1,2,4-oxadiazole, or 4,5-dihydro-1,2,4-oxadiazole, and an ynamide, PhC≡C-N(Ts)Me, proceeding via the formation of the aforementioned α-imino gold carbene intermediate which, after intramolecular capture, regioselectively produces 2-amino-3-phenyl-7-acyl indoles, N-acyl-5-aminoimidazoles, or N-alkyl-4-aminoimidazoles, respectively. In all cases, the regioselectivity of the substituents at 2, 3 in the 7-acyl-indole ring and 4, 5 in the substituted imidazole ring is decided at the first transition state, involving the attack of nitrogen on the C1 or C2 carbon of the activated ynamide. A subsequent and steep energy drop furnishes the key α-imino gold carbene. These features are more pronounced for anthranil and 4,5-dihydro-1,2,4-oxadiazole reactions. Strikingly, in the 4,5-dihydro-1,2,4-oxadiazole reaction the significant drop of energy is due to the formation of an unstable α-imino gold carbene, which after a spontaneous benzaldehyde elimination is converted to a stabilized one. Compared to anthranil, the reaction pathways for 1,2,4-oxadiazoles or 4,5-dihydro-1,2,4-oxadiazoles are found to be significantly more complex than anticipated in the original research. For instance, compared to the formation of a five-member ring from the α-imino gold carbene, one competitive route involves the formation of intermediates consisting of a four-member ring condensed with a three-member ring, which after a metathesis and ring expansion led to the imidazole ring.
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4
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Baffour Pipim G, Opoku E. Catalyst-free [3 + 2] cycloaddition reaction of oxa-, aza-, and thio-bicyclic alkenes with cyclic and acyclic nitrones: A mechanistic study. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113790] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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5
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Hu J, Yang B, Liu Z. Assessing the Activity Trend of Metal Nitride Catalysts for Ammonia Synthesis Based on Theory of Chemical Potential Kinetics. ChemistrySelect 2022. [DOI: 10.1002/slct.202201359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jingya Hu
- School of Physical Science and Technology ShanghaiTech University 393 Middle Huaxia Road Shanghai 201210 China
| | - Bo Yang
- School of Physical Science and Technology ShanghaiTech University 393 Middle Huaxia Road Shanghai 201210 China
| | - Zhi Liu
- School of Physical Science and Technology ShanghaiTech University 393 Middle Huaxia Road Shanghai 201210 China
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6
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Donkor B, Umar AR, Opoku E. Mechanistic elucidation of the tandem Diels–Alder/(3 + 2) cycloadditions in the design and syntheses of heterosteroids. J Mol Model 2022; 28:70. [DOI: 10.1007/s00894-022-05063-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 02/16/2022] [Indexed: 11/28/2022]
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7
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Hok L, Vianello R. Direct Metal-Free Transformation of Alkynes to Nitriles: Computational Evidence for the Precise Reaction Mechanism. Int J Mol Sci 2021; 22:3193. [PMID: 33801102 PMCID: PMC8004279 DOI: 10.3390/ijms22063193] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 03/10/2021] [Accepted: 03/19/2021] [Indexed: 11/17/2022] Open
Abstract
Density functional theory calculations elucidated the precise reaction mechanism for the conversion of diphenylacetylenes into benzonitriles involving the cleavage of the triple C≡C bond, with N-iodosuccinimide (NIS) as an oxidant and trimethylsilyl azide (TMSN3) as a nitrogen donor. The reaction requires six steps with the activation barrier ΔG‡ = 33.5 kcal mol-1 and a highly exergonic reaction free-energy ΔGR = -191.9 kcal mol-1 in MeCN. Reaction profiles agree with several experimental observations, offering evidence for the formation of molecular I2, interpreting the necessity to increase the temperature to finalize the reaction, and revealing thermodynamic aspects allowing higher yields for alkynes with para-electron-donating groups. In addition, the proposed mechanism indicates usefulness of this concept for both internal and terminal alkynes, eliminates the option to replace NIS by its Cl- or Br-analogues, and strongly promotes NaN3 as an alternative to TMSN3. Lastly, our results advise increasing the solvent polarity as another route to advance this metal-free strategy towards more efficient processes.
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Affiliation(s)
| | - Robert Vianello
- Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia;
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8
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Paularokiadoss F, Antony Sandosh T, Sekar A, Christopher Jeyakumar T. Theoretical studies of group 10 metal gallylene complexes [TM(CO)3(GaX)]. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2020.113139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Vorob′ev AY, Borodkin GI, Andreev RV, Shubin VG. 1,3-Dipolar cycloaddition of cyanopyridines to heterocyclic N-imines: experimental and theoretical study. Chem Heterocycl Compd (N Y) 2021. [DOI: 10.1007/s10593-021-02905-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Piña JJ, Gil DM, Pérez H. Revealing new non-covalent interactions in polymorphs and hydrates of Acyclovir: Hirshfeld surface analysis, NCI plots and energetic calculations. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2020.113133] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Novikov AS. Why [2 + 2]-cycloaddition reactions between isocyanates and imines do not occur in Pd-activation conditions? Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119758] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Oladipo SD, Mocktar C, Omondi B. In vitro biological studies of heteroleptic Ag(I) and Cu(I) unsymmetrical N,N′-diarylformamidine dithiocarbamate phosphine complexes; the effect of the metal center. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2020.05.039] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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13
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Zelenkov LE, Kuznetsov ML, Andrusenko EV, Avdontceva MS, Starova GL, Bokach NA, Kukushkin VY. Nickel( ii)-mediated cyanamide–pyrazole coupling highlights distinct reactivity of NCNR 2 and NCR nitrile ligands. NEW J CHEM 2020. [DOI: 10.1039/d0nj00704h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The nickel(ii) center efficiently promotes the cyanamide–pyrazole coupling to give bis-chelate and tris-chelate products. The formation of the tris-chelate product for dialkylcyanamides is thermodynamically favorable.
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Affiliation(s)
- Lev E. Zelenkov
- Institute of Chemistry
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
| | - Maxim L. Kuznetsov
- Institute of Chemistry
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
- Centro de Química Estrutural
| | - Elena V. Andrusenko
- Institute of Chemistry
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
| | - Margarita S. Avdontceva
- Institute of Earth Sciences
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
| | - Galina L. Starova
- Institute of Chemistry
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
| | - Nadezhda A. Bokach
- Institute of Chemistry
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
| | - Vadim Yu. Kukushkin
- Institute of Chemistry
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
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14
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Il’in MV, Sysoeva AA, Bolotin DS, Novikov AS, Suslonov VV, Rogacheva EV, Kraeva LA, Kukushkin VY. Aminonitrones as highly reactive bifunctional synthons. An expedient one-pot route to 5-amino-1,2,4-triazoles and 5-amino-1,2,4-oxadiazoles – potential antimicrobials targeting multi-drug resistant bacteria. NEW J CHEM 2019. [DOI: 10.1039/c9nj04529e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A four-component one-pot reaction proceeds very rapidly under mild conditions and gives the heterocyclic systems in good yields.
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Affiliation(s)
- Mikhail V. Il’in
- Institute of Chemistry
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
| | - Alexandra A. Sysoeva
- Institute of Chemistry
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
| | - Dmitrii S. Bolotin
- Institute of Chemistry
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
| | - Alexander S. Novikov
- Institute of Chemistry
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
| | - Vitalii V. Suslonov
- Center for X-ray Diffraction Studies
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
| | | | - Liudmila A. Kraeva
- Saint Petersburg Pasteur Institute
- Saint Petersburg
- Russian Federation
- S. M. Kirov Military Medical Academy
- Saint Petersburg
| | - Vadim Yu. Kukushkin
- Institute of Chemistry
- Saint Petersburg State University
- Saint Petersburg
- Russian Federation
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15
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Melekhova AA, Novikov AS, Dubovtsev AY, Zolotarev AA, Bokach NA. Tris(3,5-dimethylpyrazolyl)methane copper(I) complexes featuring one disubstituted cyanamide ligand. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.09.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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16
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Kinzhalov MA, Parfenova SN, Novikov AS, Katlenok EA, Puzyk MV, Avdontceva MS, Bokach NA. Cyclometalated Iridium(III) Complexes Featuring Disubstituted Cyanamides. ChemistrySelect 2018. [DOI: 10.1002/slct.201802900] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Mikhail A. Kinzhalov
- Saint Petersburg State University7/9 Universitetskaya Nab., Saint Petersburg 199034 Russian Federation
| | - Suzanna N. Parfenova
- Saint Petersburg State University7/9 Universitetskaya Nab., Saint Petersburg 199034 Russian Federation
| | - Alexander S. Novikov
- Saint Petersburg State University7/9 Universitetskaya Nab., Saint Petersburg 199034 Russian Federation
| | - Evgeniy A. Katlenok
- Scientific-research laboratory of Ltd “THP”, Moscow highway 13, Saint Petersburg 196158 Russian Federation
| | - Mikhail V. Puzyk
- Herzen State Pedagogical University, Nab. reki Moiki 48 Saint Petersburg 191186 Russian Federation
| | - Margarita S. Avdontceva
- Saint Petersburg State University7/9 Universitetskaya Nab., Saint Petersburg 199034 Russian Federation
| | - Nadezhda A. Bokach
- Saint Petersburg State University7/9 Universitetskaya Nab., Saint Petersburg 199034 Russian Federation
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17
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Yunusova S, Bolotin DS, Suslonov VV, Vovk MA, Tolstoy PM, Kukushkin VY. 3-Dialkylamino-1,2,4-triazoles via Zn II-Catalyzed Acyl Hydrazide-Dialkylcyanamide Coupling. ACS OMEGA 2018; 3:7224-7234. [PMID: 31458884 PMCID: PMC6644373 DOI: 10.1021/acsomega.8b01047] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 06/15/2018] [Indexed: 05/08/2023]
Abstract
Zinc(II)-catalyzed (10 mol % ZnCl2) coupling of acyl hydrazides and dialkylcyanamides in ethanol leads to 3-dialkylamino-1,2,4-triazoles (76-99%; 17 examples). This reaction represents a novel, straightforward, and high-yielding approach to practically important 3-NR2-1,2,4-triazoles, which utilizes commercially available and/or easily generated substrates. Seventeen new 3-NR2-1,2,4-triazoles were characterized by HRESI+-MS and IR, 1H, and 13C{1H} NMR spectroscopies and five species additionally by single-crystal X-ray diffraction (XRD). The ZnII-catalyzed reaction proceeds via initial generation of the [Zn{RC(=O)NHNH2}3](ZnCl4) complexes (exemplified by isolation of the complex with R = Ph, 76%; characterized by HRESI+-MS, IR, CP-MAS TOSS 13C{1H} NMR, and XRD). Electronic effects of substituents at the acyl hydrazide moiety do not significantly affect the reaction rate and the yield of the target triazoles, whereas the steric hindrances reduce the reaction rate without affecting the yield of the heterocycles.
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Affiliation(s)
- Sevilya
N. Yunusova
- Institute
of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg 199034, Russian Federation
| | - Dmitrii S. Bolotin
- Institute
of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg 199034, Russian Federation
- E-mail: (D.S.B.)
| | - Vitalii V. Suslonov
- Center for X-ray Diffraction
Studies, Center for Magnetic Resonance, Saint Petersburg
State University, Universitetskii
Pr., 26, Saint Petersburg 199034, Russian Federation
| | - Mikhail A. Vovk
- Center for X-ray Diffraction
Studies, Center for Magnetic Resonance, Saint Petersburg
State University, Universitetskii
Pr., 26, Saint Petersburg 199034, Russian Federation
| | - Peter M. Tolstoy
- Center for X-ray Diffraction
Studies, Center for Magnetic Resonance, Saint Petersburg
State University, Universitetskii
Pr., 26, Saint Petersburg 199034, Russian Federation
| | - Vadim Yu. Kukushkin
- Institute
of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg 199034, Russian Federation
- E-mail: (V.Y.K.)
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19
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Jiang KM, Luesakul U, Zhao SY, An K, Muangsin N, Neamati N, Jin Y, Lin J. Tautomeric-Dependent Lactam Cycloaddition with Nitrile Oxide: Facile Synthesis of 1,2,4-Oxadiazole[4,5- a]indolone Derivatives. ACS OMEGA 2017; 2:3123-3134. [PMID: 30023685 PMCID: PMC6044867 DOI: 10.1021/acsomega.7b00490] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Accepted: 06/19/2017] [Indexed: 06/08/2023]
Abstract
A concise, metal-free, and gram-scale strategy to convert indoline-2,3-diones to 1,2,4-oxadiazole[4,5-a]indolones through an improved [3 + 2] cycloaddition of α-ketone-lactam with nitrile oxides has been developed. The lactim form of the resonance structure of isatin in protic solvents is the key active dipolarophile that shows chemo- and regioselectivity under experimental and theoretical conditions. This strategy conveniently enabled the assembly of several 1,2,4-oxadiazole[4,5-a]indolines with a broad range of functional groups. Compounds 3a and 4b exhibit cytotoxicity in the NCI/ADR-RES, SKOV3, and OVCAR8 cell lines.
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Affiliation(s)
- Kun-Ming Jiang
- Key
Laboratory of Medicinal Chemistry for Natural Resource, Ministry of
Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Urarika Luesakul
- Department
of Medicinal Chemistry, College of Pharmacy, and Translational Oncology
Program, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department
of Chemistry, Faculty of Science, Chulalongkorn
University, Bangkok 10330, Thailand
| | - Shu-Yue Zhao
- Key
Laboratory of Medicinal Chemistry for Natural Resource, Ministry of
Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Kun An
- Key
Laboratory of Medicinal Chemistry for Natural Resource, Ministry of
Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Nongnuj Muangsin
- Department
of Chemistry, Faculty of Science, Chulalongkorn
University, Bangkok 10330, Thailand
| | - Nouri Neamati
- Department
of Medicinal Chemistry, College of Pharmacy, and Translational Oncology
Program, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Yi Jin
- Key
Laboratory of Medicinal Chemistry for Natural Resource, Ministry of
Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
- Department
of Medicinal Chemistry, College of Pharmacy, and Translational Oncology
Program, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Jun Lin
- Key
Laboratory of Medicinal Chemistry for Natural Resource, Ministry of
Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
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20
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Melekhova AA, Novikov AS, Panikorovskii TL, Bokach NA, Kukushkin VY. A novel family of homoleptic copper(i) complexes featuring disubstituted cyanamides: a combined synthetic, structural, and theoretical study. NEW J CHEM 2017. [DOI: 10.1039/c7nj02798b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Homoleptic copper(i) complexes featuring disubstituted cyanamides were obtained and characterized using experimental methods and their properties were studied theoretically.
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Affiliation(s)
- Anna A. Melekhova
- Saint Petersburg State University
- 199034 Saint Petersburg
- Russian Federation
| | | | | | - Nadezhda A. Bokach
- Saint Petersburg State University
- 199034 Saint Petersburg
- Russian Federation
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