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Matamoros E, Pérez EMS, Light ME, Cintas P, Martínez RF, Palacios JC. A True Reverse Anomeric Effect Does Exist After All: A Hydrogen Bonding Stereocontrolling Effect in 2-Iminoaldoses. J Org Chem 2024; 89:7877-7898. [PMID: 38752850 PMCID: PMC11165589 DOI: 10.1021/acs.joc.4c00562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Revised: 04/18/2024] [Accepted: 04/29/2024] [Indexed: 06/13/2024]
Abstract
The reverse anomeric effect is usually associated with the equatorial preference of nitrogen substituents at the anomeric center. Once postulated as another anomeric effect with explanations ranging from electrostatic interactions to delocalization effects, it is now firmly considered to be essentially steric in nature. Through an extensive research on aryl imines from 2-amino-2-deoxyaldoses, spanning nearly two decades, we realized that such substances often show an anomalous anomeric behavior that cannot easily be rationalized on the basis of purely steric grounds. The apparent preference, or stabilization, of the β-anomer takes place to an extent that not only neutralizes but also overcomes the normal anomeric effect. Calculations indicate that there is no stereoelectronic effect opposing the anomeric effect, resulting from the repulsion between electron lone pairs on the imine nitrogen and the endocyclic oxygen. Such data and compelling structural evidence unravel why the exoanomeric effect is largely inhibited. We are now confident, as witnessed by 2-iminoaldoses, that elimination of the exo-anomeric effect in the α-anomer is due to the formation of an intramolecular hydrogen bond between the anomeric hydroxyl and the iminic nitrogen, thereby accounting for a true electronic effect. In addition, discrete solvation may help justify the observed preference for the β-anomer.
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Affiliation(s)
- Esther Matamoros
- Departamento
de Química Orgánica e Inorgánica, Facultad de
Ciencias, and Instituto del Agua, Cambio Climático y Sostenibilidad
(IACYS), Universidad de Extremadura, 06006 Badajoz, Spain
- Departamento
de Química Orgánica, Universidad
de Málaga, Campus
Teatinos s/n, 29071 Málaga, Spain
- Instituto
de Investigación Biomédica de Málaga y Plataforma
en Nanomedicina − IBIMA, Plataforma Bionand, Parque Tecnológico de Andalucía, 29590 Málaga, Spain
| | - Esther M. S. Pérez
- Departamento
de Química Orgánica e Inorgánica, Facultad de
Ciencias, and Instituto del Agua, Cambio Climático y Sostenibilidad
(IACYS), Universidad de Extremadura, 06006 Badajoz, Spain
| | - Mark E. Light
- Department
of Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, Southampton SO17 1BJ, U.K.
| | - Pedro Cintas
- Departamento
de Química Orgánica e Inorgánica, Facultad de
Ciencias, and Instituto del Agua, Cambio Climático y Sostenibilidad
(IACYS), Universidad de Extremadura, 06006 Badajoz, Spain
| | - R. Fernando Martínez
- Departamento
de Química Orgánica e Inorgánica, Facultad de
Ciencias, and Instituto del Agua, Cambio Climático y Sostenibilidad
(IACYS), Universidad de Extremadura, 06006 Badajoz, Spain
| | - Juan C. Palacios
- Departamento
de Química Orgánica e Inorgánica, Facultad de
Ciencias, and Instituto del Agua, Cambio Climático y Sostenibilidad
(IACYS), Universidad de Extremadura, 06006 Badajoz, Spain
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2
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Mokhayeri Z, Fazaeli R. Effect of Symmetry State and Electron Delocalization on the Conformational and Structural Properties of S2X2 (S2F2/S2Cl2/S2Br2). RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2022. [DOI: 10.1134/s1990793122050062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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3
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Masnabadi N, Thalji MR, Alhasan HS, Mahmoodi Z, Soldatov AV, Ali GAM. Structural, Electronic, Reactivity, and Conformational Features of 2,5,5-Trimethyl-1,3,2-diheterophosphinane-2-sulfide, and Its Derivatives: DFT, MEP, and NBO Calculations. Molecules 2022; 27:molecules27134011. [PMID: 35807257 PMCID: PMC9268642 DOI: 10.3390/molecules27134011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Revised: 06/11/2022] [Accepted: 06/17/2022] [Indexed: 01/18/2023] Open
Abstract
In this study, we used density functional theory (DFT) and natural bond orbital (NBO) analysis to determine the structural, electronic, reactivity, and conformational features of 2,5,5-trimethyl-1,3,2-di-heteroatom (X) phosphinane-2-sulfide derivatives (X = O (compound 1), S (compound 2), and Se (compound 3)). We discovered that the features improve dramatically at 6-31G** and B3LYP/6-311+G** levels. The level of theory for the molecular structure was optimized first, followed by the frontier molecular orbital theory development to assess molecular stability and reactivity. Molecular orbital calculations, such as the HOMO–LUMO energy gap and the mapping of molecular electrostatic potential surfaces (MEP), were performed similarly to DFT calculations. In addition, the electrostatic potential of the molecule was used to map the electron density on a surface. In addition to revealing molecules’ size and shape distribution, this study also shows the sites on the surface where molecules are most chemically reactive.
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Affiliation(s)
- Nasrin Masnabadi
- Department of Chemistry, Roudehen Branch, Islamic Azad University, Roudehen P.O. Box 189, Iran
- Correspondence: or (N.M.); or (G.A.M.A.)
| | - Mohammad R. Thalji
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Gyeongbuk, Korea;
| | - Huda S. Alhasan
- Environmental Research and Studies Center, University of Babylon, Babil 51002, Iraq;
| | - Zahra Mahmoodi
- Department of Chemistry, University of Applied Science and Technology, Center of Arya Gach Poldokhtar, Tehran P.O. Box 68, Iran;
| | - Alexander V. Soldatov
- The Smart Materials Research Institute, Southern Federal University, Sladkova Str. 178/24, Rostov-on-Don 344006, Russia;
| | - Gomaa A. M. Ali
- Chemistry Department, Faculty of Science, Al-Azhar University, Assiut 71524, Egypt
- Correspondence: or (N.M.); or (G.A.M.A.)
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4
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Tong C, Xu X, Qing F. Nucleophilic and Radical Heptafluoroisopropoxylation with Redox‐Active Reagents. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Chao‐Lai Tong
- Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic Chemistry University of Chinese Academy of Science Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 China
| | - Xiu‐Hua Xu
- Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic Chemistry University of Chinese Academy of Science Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 China
| | - Feng‐Ling Qing
- Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic Chemistry University of Chinese Academy of Science Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 China
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5
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Tong CL, Xu XH, Qing FL. Nucleophilic and Radical Heptafluoroisopropoxylation with Redox-Active Reagents. Angew Chem Int Ed Engl 2021; 60:22915-22924. [PMID: 34414643 DOI: 10.1002/anie.202109572] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 08/12/2021] [Indexed: 11/05/2022]
Abstract
The heptafluoroisopropyl group (CF(CF3 )2 ) is prevalent in pharmaceuticals and agrichemicals. However, heptafluoroisopropoxylated (OCF(CF3 )2 ) compounds remain largely underexplored, presumably due to the lack of efficient access to these compounds. Herein, we disclose the practical and efficient heptafluoroisopropoxylation reactions through the invention of a series of redox-active N-OCF(CF3 )2 reagents. These reagents were readily prepared from the oxidative heptafluoroisopropylation of hydroxylamines with AgCF(CF3 )2 . The substitutions on the nitrogen atom significantly affected the properties and reactivities of N-OCF(CF3 )2 reagents. Accordingly, two types of N-OCF(CF3 )2 reagents including N-OCF(CF3 )2 phthalimide A and N-OCF(CF3 )2 benzotriazolium salt O' were used as OCF(CF3 )2 anion and radical precursors, respectively. This protocol enables the direct heptafluoroisopropoxylation of a range of substrates, delivering the corresponding products in moderate to excellent yields.
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Affiliation(s)
- Chao-Lai Tong
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Science, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, 200032, China
| | - Xiu-Hua Xu
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Science, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, 200032, China
| | - Feng-Ling Qing
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Science, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, 200032, China
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6
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Alabugin IV, Kuhn L, Krivoshchapov NV, Mehaffy P, Medvedev MG. Anomeric effect, hyperconjugation and electrostatics: lessons from complexity in a classic stereoelectronic phenomenon. Chem Soc Rev 2021; 50:10212-10252. [PMID: 34542133 DOI: 10.1039/d1cs00564b] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the interplay of multiple components (steric, electrostatic, stereoelectronic, dispersive, etc.) that define the overall energy, structure, and reactivity of organic molecules can be a daunting task. The task becomes even more difficult when multiple approaches based on different physical premises disagree in their analysis of a multicomponent molecular system. Herein, we will use a classic conformational "oddity", the anomeric effect, to discuss the value of identifying the key contributors to reactivity that can guide chemical predictions. After providing the background related to the relevant types of hyperconjugation and a brief historic outline of the origins of the anomeric effect, we outline variations of its patterns and provide illustrative examples for the role of the anomeric effect in structure, stability, and spectroscopic properties. We show that the complete hyperconjugative model remains superior in explaining the interplay between structure and reactivity. We will use recent controversies regarding the origin of the anomeric effect to start a deeper discussion relevant to any electronic effect. Why are such questions inherently controversial? How to describe a complex quantum system using a model that is "as simple as possible, but no simpler"? What is a fair test for such a model? Perhaps, instead of asking "who is right and who is wrong?" one should ask "why do we disagree?". Stereoelectronic thinking can reconcile quantum complexity with chemical intuition and build the conceptual bridge between structure and reactivity. Even when many factors contribute to the observed structural and conformational trends, electron delocalization is a dominating force when the electronic demand is high (i.e., bonds are breaking as molecules distort from their equilibrium geometries). In these situations, the role of orbital interactions increases to the extent where they can define reactivity. For example, negative hyperconjugation can unleash the "underutilized" stereoelectronic power of unshared electrons (i.e., the lone pairs) to stabilize a developing positive charge at an anomeric carbon. This analysis paves the way for the broader discussion of the omnipresent importance of negative hyperconjugation in oxygen-containing functional groups. From that point of view, the stereoelectronic component of the anomeric effect plays a unique role in guiding reaction design.
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Affiliation(s)
- Igor V Alabugin
- Department of Chemistry and Biochemistry, Florida State University, USA.
| | - Leah Kuhn
- Department of Chemistry and Biochemistry, Florida State University, USA.
| | - Nikolai V Krivoshchapov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation. .,Lomonosov Moscow State University, Leninskie Gory 1 (3), Moscow, 119991, Russian Federation
| | - Patricia Mehaffy
- Department of Chemistry and Biochemistry, Florida State University, USA.
| | - Michael G Medvedev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation. .,A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova St., 119991 Moscow, Russian Federation
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7
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Alabugin IV, Kuhn L, Medvedev MG, Krivoshchapov NV, Vil' VA, Yaremenko IA, Mehaffy P, Yarie M, Terent'ev AO, Zolfigol MA. Stereoelectronic power of oxygen in control of chemical reactivity: the anomeric effect is not alone. Chem Soc Rev 2021; 50:10253-10345. [PMID: 34263287 DOI: 10.1039/d1cs00386k] [Citation(s) in RCA: 66] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Although carbon is the central element of organic chemistry, oxygen is the central element of stereoelectronic control in organic chemistry. Generally, a molecule with a C-O bond has both a strong donor (a lone pair) and a strong acceptor (e.g., a σ*C-O orbital), a combination that provides opportunities to influence chemical transformations at both ends of the electron demand spectrum. Oxygen is a stereoelectronic chameleon that adapts to the varying situations in radical, cationic, anionic, and metal-mediated transformations. Arguably, the most historically important stereoelectronic effect is the anomeric effect (AE), i.e., the axial preference of acceptor groups at the anomeric position of sugars. Although AE is generally attributed to hyperconjugative interactions of σ-acceptors with a lone pair at oxygen (negative hyperconjugation), recent literature reports suggested alternative explanations. In this context, it is timely to evaluate the fundamental connections between the AE and a broad variety of O-functional groups. Such connections illustrate the general role of hyperconjugation with oxygen lone pairs in reactivity. Lessons from the AE can be used as the conceptual framework for organizing disjointed observations into a logical body of knowledge. In contrast, neglect of hyperconjugation can be deeply misleading as it removes the stereoelectronic cornerstone on which, as we show in this review, the chemistry of organic oxygen functionalities is largely based. As negative hyperconjugation releases the "underutilized" stereoelectronic power of unshared electrons (the lone pairs) for the stabilization of a developing positive charge, the role of orbital interactions increases when the electronic demand is high and molecules distort from their equilibrium geometries. From this perspective, hyperconjugative anomeric interactions play a unique role in guiding reaction design. In this manuscript, we discuss the reactivity of organic O-functionalities, outline variations in the possible hyperconjugative patterns, and showcase the vast implications of AE for the structure and reactivity. On our journey through a variety of O-containing organic functional groups, from textbook to exotic, we will illustrate how this knowledge can predict chemical reactivity and unlock new useful synthetic transformations.
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Affiliation(s)
- Igor V Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA.
| | - Leah Kuhn
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA.
| | - Michael G Medvedev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation.,A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova St., 119991 Moscow, Russian Federation
| | - Nikolai V Krivoshchapov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation.,Lomonosov Moscow State University, Leninskie Gory 1 (3), Moscow, 119991, Russian Federation
| | - Vera A Vil'
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
| | - Ivan A Yaremenko
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
| | - Patricia Mehaffy
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA.
| | - Meysam Yarie
- Department of Organic Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan 65167, Iran
| | - Alexander O Terent'ev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
| | - Mohammad Ali Zolfigol
- Department of Organic Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan 65167, Iran
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8
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Lin X, Wu W, Mo Y. A theoretical perspective of the agostic effect in early transition metal compounds. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213401] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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9
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Singh V, Ibnusaud I, Gadre SR, Deshmukh MM. Fragmentation method reveals a wide spectrum of intramolecular hydrogen bond energies in antioxidant natural products. NEW J CHEM 2020. [DOI: 10.1039/d0nj00304b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Very strong and weak IHBs in curcumin.
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Affiliation(s)
- Vijay Singh
- Department of Chemistry
- Dr. Harisingh Gour Vishwavidyalaya (A Central University)
- Sagar
- India
| | - Ibrahim Ibnusaud
- Institute for Intensive Research in Basic Sciences
- Mahatma Gandhi University Campus
- P.O. Kottayam
- India
| | - Shridhar R. Gadre
- Interdisciplinary School of Scientific Computing and Department of Chemistry
- Savitribai Phule Pune University
- Pune 411 007
- India
| | - Milind M. Deshmukh
- Department of Chemistry
- Dr. Harisingh Gour Vishwavidyalaya (A Central University)
- Sagar
- India
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10
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Samanta SS, Roche SP. Synthesis and Reactivity of α-Haloglycine Esters: Hyperconjugation in Action. European J Org Chem 2019; 2019:6597-6605. [PMID: 32351314 DOI: 10.1002/ejoc.201901033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A general and efficient synthesis of α-haloglycine esters from commercially available feedstock chemicals, in a single step, is reported. The reactivity of these α-haloglycine esters with various nucleophiles was studied as surrogates of α-iminoesters upon activation with hydrogen-bond donor catalysts. DFT calculations on the α-haloglycine structures (X = F, Cl, Br) accompanied by an X-ray characterization of the α-bromoglycine ester support the existence of a "generalized" anomeric effect created by hyperconjugation. This peculiar hyperconjugative effect is proposed to be responsible for the enhanced halogen nucleofugality leading to a facile halogen abstraction by hydrogen-bond donor catalysts. This reactivity was exploited with thiourea catalysts on several catalytic transformations (aza-Friedel-Crafts and Mannich reactions) for the synthesis of several types of non-proteinogenic α-amino esters.
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Affiliation(s)
- Shyam S Samanta
- Department of Chemistry and Biochemistry, Florida Atlantic University, Physical Science Building, 777 Glades Road, Boca Raton, FL, 33431, United States
| | - Stéphane P Roche
- Department of Chemistry and Biochemistry, Florida Atlantic University, Physical Science Building, 777 Glades Road, Boca Raton, FL, 33431, United States
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11
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Lin X, Wu W, Mo Y. Agostic Interactions in Early Transition-Metal Complexes: Roles of Hyperconjugation, Dispersion, and Steric Effect. Chemistry 2019; 25:6591-6599. [PMID: 30883975 DOI: 10.1002/chem.201900436] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 03/13/2019] [Indexed: 01/19/2023]
Abstract
The agostic interaction is a ubiquitous phenomenon in catalytic processes and transition-metal complexes, and hyperconjugation has been well recognized as its origin. Yet, recent studies showed that either short-range London dispersion or structural constraints could be the driving force, although proper evaluation of the role of hyperconjugation therein is needed. Herein, a simple variant of valence bond theory was employed to study a few exemplary Ti complexes with α- or β-agostic interactions and interpret the agostic effect in terms of the steric effect, hyperconjugation, and dispersion. For the complexes [MeTiCl3 (dmpe)] and [MeTiCl3 (dhpe)] with α-agostic interactions, hyperconjugation plays the dominant role with comparable magnitudes in both systems, but dispersion is solely responsible for the stronger agostic interaction in the former compared with the latter. For the complexes [EtTiCl3 (dmpe)] and [EtTiCl3 (dhpe)] with β-agostic interactions, however, hyperconjugation and dispersion play comparable roles, and the weaker steric repulsion leads to a stronger agostic effect in the former than in the latter. Thus, the present study clarifies the variable and sensitive roles of steric, hyperconjugative, and dispersion interactions in the agostic interaction.
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Affiliation(s)
- Xuhui Lin
- The State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry and College of Chemistry and Chemical, Engineering, Xiamen University, Xiamen, Fujian, 361005, P.R. China
| | - Wei Wu
- The State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry and College of Chemistry and Chemical, Engineering, Xiamen University, Xiamen, Fujian, 361005, P.R. China
| | - Yirong Mo
- Department of Chemistry, Western Michigan University, Kalamazoo, MI, 49008, USA
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12
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Wiberg KB, Bailey WF, Lambert KM, Stempel ZD. The Anomeric Effect: It’s Complicated. J Org Chem 2018; 83:5242-5255. [DOI: 10.1021/acs.joc.8b00707] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kenneth B. Wiberg
- Department of Chemistry, Yale University, 275 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - William F. Bailey
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, United States
| | - Kyle M. Lambert
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, United States
| | - Zachary D. Stempel
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, United States
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13
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Buschbeck-Alvarado ME, Hernández-Fernández G, Hernández-Trujillo J, Cortés-Guzmán F, Cuevas G. Charge transfer and electron localization as the origin of the anomeric effect in the O─C─O segment of dimethoxymethane and spiroketals. J PHYS ORG CHEM 2017. [DOI: 10.1002/poc.3793] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | | | | | | | - Gabriel Cuevas
- Instituto de Química; Universidad Nacional Autónoma de México; Ciudad de México Mexico
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14
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Cao X, Liu S, Rong C, Lu T, Liu S. Is there a generalized anomeric effect? Analyses from energy components and information-theoretic quantities from density functional reactivity theory. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.09.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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15
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Hasanzadeh N, Nori-Shargh D, Yahyaei H, Mousavi SN, Kamrava S. Exploring the Origin of the Generalized Anomeric Effects in the Acyclic Nonplanar Systems. J Phys Chem A 2017; 121:5548-5560. [PMID: 28661674 DOI: 10.1021/acs.jpca.7b04447] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Contrary to the published conclusions in the literature concerning the origin of the generalized anomeric relationships in open-chain nonplanar systems, its origin has remained an open question. In order to explore the origin of the generalized anomeric relationships in open-chain nonplanar systems, we assessed the roles and contributions of the effective factors on the conformational properties of methyl propargyl ether (1), methyl propargyl sulfide (2), and methyl propargyl selenide (3) by means of the G3MP2, CCSD(T), MP2, LC-ωPBE, and B3LYP methods and natural bond orbital (NBO) interpretations. We examined the contributions of the hyperconjugative interactions on the conformational preferences of compounds 1-3 by the deletions of the orbitals overlapping from the Fock matrices of the gauche- and anti-conformations. The trend observed for energy changes in the Fock matrices justify the variations of the gauche-conformations preferences going from compound 1 to compound 3, revealing that the hyperconjugative interactions are solely responsible for the generalized anomeric relationships in compounds 1-3. Accordingly, the conclusions published in the literature concerning the origin of the generalized anomeric effect in the acyclic nonplanar compounds should be revised by these findings. The Pauli exchange type repulsions (PETR) are in favors of the gauche-conformations and the variations of the PETR differences between the gauche- and anti-conformations of compounds 1-3 correlate well with their gauche-conformations preferences, revealing that the generalized anomeric relationships in compounds 1-3 have also the Pauli exchange-type repulsions origin. The resemblance between the preorthogonal natural bond orbitals (that are involved in the hyperconjugative interactions) and their corresponding molecular orbitals have been investigated.
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Affiliation(s)
- Neda Hasanzadeh
- Department of Chemistry, Ahvaz Branch, Islamic Azad University , Ahvaz, Iran
| | - Davood Nori-Shargh
- Department of Chemistry, Arak Branch, Islamic Azad University , Arak, Iran
| | - Hooriye Yahyaei
- Department of Chemistry, Zanjan Branch, Islamic Azad University , Zanjan, Iran
| | - Seiedeh Negar Mousavi
- Department of Nanochemistry, Faculty of Pharmaceutical Chemistry, Pharmaceutical Science Branch, Islamic Azad University (IAUPS) , Tehran, Iran
| | - Sahar Kamrava
- Department of Chemistry, Arak Branch, Islamic Azad University , Arak, Iran
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16
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Xie Q, Ni C, Zhang R, Li L, Rong J, Hu J. Efficient Difluoromethylation of Alcohols Using TMSCF2Br as a Unique and Practical Difluorocarbene Reagent under Mild Conditions. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611823] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Qiqiang Xie
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences, Chinese Academy of Sciences; 345 Ling-Ling Road Shanghai 200032 China
| | - Chuanfa Ni
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences, Chinese Academy of Sciences; 345 Ling-Ling Road Shanghai 200032 China
| | - Rongyi Zhang
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences, Chinese Academy of Sciences; 345 Ling-Ling Road Shanghai 200032 China
- School of Physical Science and Technology; ShanghaiTech University; 100 Haike Road Shanghai 201210 China
| | - Lingchun Li
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences, Chinese Academy of Sciences; 345 Ling-Ling Road Shanghai 200032 China
| | - Jian Rong
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences, Chinese Academy of Sciences; 345 Ling-Ling Road Shanghai 200032 China
| | - Jinbo Hu
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences, Chinese Academy of Sciences; 345 Ling-Ling Road Shanghai 200032 China
- School of Physical Science and Technology; ShanghaiTech University; 100 Haike Road Shanghai 201210 China
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17
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Xie Q, Ni C, Zhang R, Li L, Rong J, Hu J. Efficient Difluoromethylation of Alcohols Using TMSCF2Br as a Unique and Practical Difluorocarbene Reagent under Mild Conditions. Angew Chem Int Ed Engl 2017; 56:3206-3210. [DOI: 10.1002/anie.201611823] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 01/24/2017] [Indexed: 01/26/2023]
Affiliation(s)
- Qiqiang Xie
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences, Chinese Academy of Sciences; 345 Ling-Ling Road Shanghai 200032 China
| | - Chuanfa Ni
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences, Chinese Academy of Sciences; 345 Ling-Ling Road Shanghai 200032 China
| | - Rongyi Zhang
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences, Chinese Academy of Sciences; 345 Ling-Ling Road Shanghai 200032 China
- School of Physical Science and Technology; ShanghaiTech University; 100 Haike Road Shanghai 201210 China
| | - Lingchun Li
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences, Chinese Academy of Sciences; 345 Ling-Ling Road Shanghai 200032 China
| | - Jian Rong
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences, Chinese Academy of Sciences; 345 Ling-Ling Road Shanghai 200032 China
| | - Jinbo Hu
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences, Chinese Academy of Sciences; 345 Ling-Ling Road Shanghai 200032 China
- School of Physical Science and Technology; ShanghaiTech University; 100 Haike Road Shanghai 201210 China
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18
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Behrouz A, Nori-Shargh D. The Importance of the Pauli Exchange-Type Repulsions and Hyperconjugative Interactions on the Conformational Properties of Halocarbonyl Isocyanates and Halocarbonyl Azides. Aust J Chem 2017. [DOI: 10.1071/ch16227] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
To gain further insight into the origin of the anomeric relationships in planar open-chain (acyclic) compounds, we examined the effects of the hyperconjugative generalized anomeric effect (HC-GAE), Pauli exchange-type repulsion (PETR), the electrostatic model associated with the dipole–dipole interactions (EM-DDI), and the attractive electrostatic interactions (AEI) between the natural atomic charges (NACs) on the conformational properties of halocarbonyl isocyanates [halogen = F (1), Cl (2), Br (3)] and halocarbonyl azides [halogen = F (4), Cl (5), Br (6)] by means of G3MP2, CCSD, MP2, and B3LYP methods with the 6–311+G** basis set on all atoms and natural bond orbital interpretation. Importantly, the deletions of the through bond LPN3→σ*C2–X6 hyperconjugative interactions from the Fock matrices of the cis- and trans-conformations lead to the increase of the cis-conformations’ stability compared with their corresponding trans-conformations going from compound 1 to 3 and from compound 4 to 6, revealing the determining effects on the conformational preferences in compounds 1–3 and 4–6. Essentially, the effects of the through space (LPN3→σ*C4–O5 and LPNα→π*Nβ=Nω, respectively) hyperconjugative interactions on the conformational preferences in the isocyanate (1–3) and azide compounds (4–6) are negligible. The EM-DDI fails to account for the conformational preferences in compounds 2, 3, 5, and 6. Therefore, the generalized anomeric relationships in compounds 1–3 and 4–6 result from the cooperative effects of the HC-GAE and PETR. The variations of the AEIs revealed their opposite effects on the trend observed for the conformational preferences in compounds 1–3 and 4–6. Contrary to the usual assumption, the much larger barrier heights of the rotation around the C2–N3 bonds in the azide compounds (4–6) compared with those in the isocyanate compounds (1–3) result from the exchange components and have no hyperconjugative origin.
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19
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Zhang H, Wu W, Ahmed BM, Mezei G, Mo Y. Adjacent Lone Pair (ALP) Effect: A Computational Approach for Its Origin. Chemistry 2016; 22:7415-21. [PMID: 27139318 DOI: 10.1002/chem.201600509] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Indexed: 11/10/2022]
Abstract
The adjacent lone pair (ALP) effect is an experimental phenomenon in certain nitrogenous heterocyclic systems exhibiting the preference of the products with lone pairs separated over other isomers with lone pairs adjacent. A theoretical elucidation of the ALP effect requires the decomposition of intramolecular energy terms and the isolation of lone pair-lone pair interactions. Here we used the block-localized wavefunction (BLW) method within the ab initio valence bond (VB) theory to derive the strictly localized orbitals which are used to accommodate one-atom centered lone pairs and two-atom centered σ or π bonds. As such, interactions among electron pairs can be directly derived. Two-electron integrals between adjacent lone pairs do not support the view that the lone pair-lone pair repulsion is responsible for the ALP effect. Instead, the disabling of π conjugation greatly diminishes the ALP effect, indicating that the reduction of π conjugation in deprotonated forms with two σ lone pairs adjacent is one of the major causes for the ALP effect. Further electrostatic potential analysis and intramolecular energy decomposition confirm that the other key factor is the favorable electrostatic attraction within the isomers with lone pairs separated.
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Affiliation(s)
- Huaiyu Zhang
- The State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, Fujian Provincial Key Laboratory of Theoretical and Computational, Chemistry, and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, 361005, P. R. China.,Department of Chemistry, Western Michigan University, Kalamazoo, MI, 49008, USA
| | - Wei Wu
- The State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, Fujian Provincial Key Laboratory of Theoretical and Computational, Chemistry, and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, 361005, P. R. China.
| | - Basil M Ahmed
- Department of Chemistry, Western Michigan University, Kalamazoo, MI, 49008, USA
| | - Gellert Mezei
- Department of Chemistry, Western Michigan University, Kalamazoo, MI, 49008, USA
| | - Yirong Mo
- Department of Chemistry, Western Michigan University, Kalamazoo, MI, 49008, USA.
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20
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Usabiaga I, González J, Arnáiz PF, León I, Cocinero EJ, Fernández JA. Modeling the tyrosine–sugar interactions in supersonic expansions: glucopyranose–phenol clusters. Phys Chem Chem Phys 2016; 18:12457-65. [DOI: 10.1039/c6cp00560h] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present here the structure of glucopyranoe–phenol complexes, as revealed by mass-resolved laser spectroscopy and DFT calculations.
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Affiliation(s)
- Imanol Usabiaga
- Dep. of Physical Chemistry
- Fac. of Science and Technology
- University of the Basque Country (UPV/EHU)
- 48940 Leioa
- Spain
| | - Jorge González
- Dep. of Physical Chemistry
- Fac. of Science and Technology
- University of the Basque Country (UPV/EHU)
- 48940 Leioa
- Spain
| | - Pedro F. Arnáiz
- Dep. of Physical Chemistry
- Fac. of Science and Technology
- University of the Basque Country (UPV/EHU)
- 48940 Leioa
- Spain
| | - Iker León
- Dep. of Physical Chemistry
- Fac. of Science and Technology
- University of the Basque Country (UPV/EHU)
- 48940 Leioa
- Spain
| | - Emilio J. Cocinero
- Dep. of Physical Chemistry
- Fac. of Science and Technology
- University of the Basque Country (UPV/EHU)
- 48940 Leioa
- Spain
| | - José A. Fernández
- Dep. of Physical Chemistry
- Fac. of Science and Technology
- University of the Basque Country (UPV/EHU)
- 48940 Leioa
- Spain
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21
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Ortega PGR, Montejo M, López González JJ. Hyperconjugative and Electrostatic Interactions as Anomeric Triggers in Archetypical 1,4-Dioxane Derivatives. Chemphyschem 2015; 17:530-40. [DOI: 10.1002/cphc.201500989] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Indexed: 11/10/2022]
Affiliation(s)
| | - Manuel Montejo
- Department of Physical and Analytical Chemistry; University of Jaén; 23071 Jaén Spain
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22
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Gomes GDP, Vil' V, Terent'ev A, Alabugin IV. Stereoelectronic source of the anomalous stability of bis-peroxides. Chem Sci 2015; 6:6783-6791. [PMID: 28757970 PMCID: PMC5508698 DOI: 10.1039/c5sc02402a] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 09/03/2015] [Indexed: 12/02/2022] Open
Abstract
The unusual stability of bis- and tris-peroxides contradicts the conventional wisdom - some of them can melt without decomposition at temperatures exceeding 100 °C. In this work, we disclose a stabilizing stereoelectronic effect that two peroxide groups can exert on each other. This stabilization originates from strong anomeric nO → σ*CO interactions that are absent in mono-peroxides but reintroduced in molecules where two peroxide moieties are separated by a CH2 group. Furthermore, such effects can be induced by other σ-acceptors and amplified by structural constraints imposed by cyclic and bicyclic frameworks.
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Affiliation(s)
- Gabriel Dos Passos Gomes
- Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306-4390 , USA . ;
| | - Vera Vil'
- N. D. Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , 47 Leninsky Prospekt , Moscow 119991 , Russian Federation . ;
| | - Alexander Terent'ev
- N. D. Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , 47 Leninsky Prospekt , Moscow 119991 , Russian Federation . ;
| | - Igor V Alabugin
- Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306-4390 , USA . ;
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23
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Abstract
The article reviews the significant contributions to, and the present status of, applications of computational methods for the characterization and prediction of protein-carbohydrate interactions. After a presentation of the specific features of carbohydrate modeling, along with a brief description of the experimental data and general features of carbohydrate-protein interactions, the survey provides a thorough coverage of the available computational methods and tools. At the quantum-mechanical level, the use of both molecular orbitals and density-functional theory is critically assessed. These are followed by a presentation and critical evaluation of the applications of semiempirical and empirical methods: QM/MM, molecular dynamics, free-energy calculations, metadynamics, molecular robotics, and others. The usefulness of molecular docking in structural glycobiology is evaluated by considering recent docking- validation studies on a range of protein targets. The range of applications of these theoretical methods provides insights into the structural, energetic, and mechanistic facets that occur in the course of the recognition processes. Selected examples are provided to exemplify the usefulness and the present limitations of these computational methods in their ability to assist in elucidation of the structural basis underlying the diverse function and biological roles of carbohydrates in their dialogue with proteins. These test cases cover the field of both carbohydrate biosynthesis and glycosyltransferases, as well as glycoside hydrolases. The phenomenon of (macro)molecular recognition is illustrated for the interactions of carbohydrates with such proteins as lectins, monoclonal antibodies, GAG-binding proteins, porins, and viruses.
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Affiliation(s)
- Serge Pérez
- Department of Molecular Pharmacochemistry, CNRS, University Grenoble-Alpes, Grenoble, France.
| | - Igor Tvaroška
- Department of Chemistry, Slovak Academy of Sciences, Bratislava, Slovak Republic; Department of Chemistry, Faculty of Natural Sciences, Constantine The Philosopher University, Nitra, Slovak Republic.
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24
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Deshmukh MM, Gadre SR, Cocinero EJ. Stability of conformationally locked free fructose: theoretical and computational insights. NEW J CHEM 2015. [DOI: 10.1039/c5nj02106e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Total stabilization is governed by three predominant factors viz. the sum of energy of all H-bonds, ring strain and anomeric stabilization.
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Affiliation(s)
- Milind M. Deshmukh
- Department of Chemistry
- Dr. Harisingh Gour Central University
- Sagar, 470003
- India
| | - Shridhar R. Gadre
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208 016
- India
| | - Emilio J. Cocinero
- Departamento de Química Física
- Facultad de Ciencia y Tecnología
- Universidad del País Vasco (UPV-EHU)
- 48080 Bilbao
- Spain
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25
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Sladek V, Holka F, Tvaroška I. Ab initio modelling of the anomeric and exo anomeric effects in 2-methoxytetrahydropyran and 2-methoxythiane corrected for intramolecular BSSE. Phys Chem Chem Phys 2015; 17:18501-13. [DOI: 10.1039/c5cp02191j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Oxygen substitution in 2-methoxytetrahydropyran by sulphur in 2-methoxythiane approximately doubles the anomeric effect, which slows down enzymatic processing of 2-methoxythiane.
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Affiliation(s)
- Vladimir Sladek
- Institute of Chemistry
- Slovak Academy of Sciences
- SK-845 38 Bratislava
- Slovakia
| | - Filip Holka
- Faculty of Materials Science and Technology in Trnava
- Slovak University of Technology in Bratislava
- SK-917 24 Trnava
- Slovakia
| | - Igor Tvaroška
- Institute of Chemistry
- Slovak Academy of Sciences
- SK-845 38 Bratislava
- Slovakia
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26
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Capozzi MAM, Capitelli F, Bottoni A, Calvaresi M, Cardellicchio C. Stacked Naphthyls and Weak Hydrogen-Bond Interactions Govern the Conformational Behavior of P-Resolved Cyclic Phosphonamides: A Combined Experimental and Computational Study. J Org Chem 2014; 79:11101-9. [DOI: 10.1021/jo502094g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
| | | | - Andrea Bottoni
- Dipartimento
di Chimica G. Ciamician, Università di Bologna, via Selmi 2, Bologna, Italy
| | - Matteo Calvaresi
- Dipartimento
di Chimica G. Ciamician, Università di Bologna, via Selmi 2, Bologna, Italy
| | - Cosimo Cardellicchio
- CNR ICCOM, Dipartimento di Chimica, Università di Bari, via Orabona
4, 70125 Bari, Italy
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27
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Loerbroks C, Böker B, Cordes J, Barrett AGM, Thiel W. Spiroaminals - Crystal Structure and Computational Investigation of Conformational Preferences and Tautomerization Reactions. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402576] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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28
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Wang C, Ying F, Wu W, Mo Y. How solvent influences the anomeric effect: roles of hyperconjugative versus steric interactions on the conformational preference. J Org Chem 2014; 79:1571-81. [PMID: 24456135 DOI: 10.1021/jo402306e] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The block-localized wave function (BLW) method, which can derive optimal electron-localized state with intramolecular electron delocalization completely deactivated, has been combined with the polarizable continuum model (PCM) to probe the variation of the anomeric effect in solution. Currently both the hyperconjugation and electrostatic models have been called to interpret the anomeric effect in carbohydrate molecules. Here we employed the BLW-PCM scheme to analyze the energy differences between α and β anomers of substituted tetrahydropyran C5OH9Y (Y = F, Cl, OH, NH2, and CH3) and tetrahydrothiopyran C5SH9Y (Y = F, Cl, OH, and CH3) in solvents including chloroform, acetone, and water. In accord with literature, our computations show that for anomeric systems the conformational preference is reduced in solution and the magnitude of reduction increases as the solvent polarity increases. Significantly, on one hand the solute-solvent interaction diminishes the intramolecular electron delocalization in β anomers more than in α anomers, thus destabilizing β anomers relatively. But on the other hand, it reduces the steric effect in β anomers much more than α anomers and thus stabilizes β anomers relatively more, leading to the overall reduction of the anomeric effect in anomeric systems in solutions.
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Affiliation(s)
- Changwei Wang
- The State Key Laboratory of Physical Chemistry of Solid Surfaces, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, and College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, China
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29
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Azofra LM, Quesada-Moreno MM, Alkorta I, Avilés-Moreno JR, López-González JJ, Elguero J. Carbohydrates in the gas phase: conformational preference ofd-ribose and 2-deoxy-d-ribose. NEW J CHEM 2014. [DOI: 10.1039/c3nj01076g] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Rísquez‐Cuadro R, García Fernández JM, Nierengarten J, Ortiz Mellet C. Fullerene‐sp
2
‐Iminosugar Balls as Multimodal Ligands for Lectins and Glycosidases: A Mechanistic Hypothesis for the Inhibitory Multivalent Effect. Chemistry 2013; 19:16791-803. [DOI: 10.1002/chem.201303158] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Indexed: 01/25/2023]
Affiliation(s)
- Rocío Rísquez‐Cuadro
- Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla, C/Prof. García González 1, 41012 Sevilla (Spain)
| | - José M. García Fernández
- Instituto de Investigaciones Químicas (IIQ), CSIC ‐ Universidad de Sevilla, Av. Américo Vespucio 49, Isla de la Cartuja, 41092 Sevilla (Spain)
| | - Jean‐François Nierengarten
- Laboratoire de Chimie des Matériaux Moléculaires, Université de Strasbourg et CNRS (UMR 7509), Ecole Européenne de Chimie, Polymères et Matériaux, 25 rue Becquerel, 67087 Strasbourg (France)
| | - Carmen Ortiz Mellet
- Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla, C/Prof. García González 1, 41012 Sevilla (Spain)
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31
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Peña I, Cocinero EJ, Cabezas C, Lesarri A, Mata S, Écija P, Daly AM, Cimas Á, Bermúdez C, Basterretxea FJ, Blanco S, Fernández JA, López JC, Castaño F, Alonso JL. Six Pyranoside Forms of Free 2-Deoxy-D-ribose. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305589] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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32
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Peña I, Cocinero EJ, Cabezas C, Lesarri A, Mata S, Écija P, Daly AM, Cimas Á, Bermúdez C, Basterretxea FJ, Blanco S, Fernández JA, López JC, Castaño F, Alonso JL. Six Pyranoside Forms of Free 2-Deoxy-D-ribose. Angew Chem Int Ed Engl 2013; 52:11840-5. [DOI: 10.1002/anie.201305589] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Indexed: 11/09/2022]
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33
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Bomble L, Steinmann SN, Perez-Peralta N, Merino G, Corminboeuf C. Bonding analysis of planar hypercoordinate atoms via the generalized BLW-LOL. J Comput Chem 2013; 34:2242-8. [DOI: 10.1002/jcc.23383] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Revised: 06/16/2013] [Accepted: 06/26/2013] [Indexed: 01/11/2023]
Affiliation(s)
- Laetitia Bomble
- Institut des Sciences et Ingénierie Chimiques; Ecole Polytechnique Fédérale de Lausanne; 1015; Lausanne; Switzerland
| | - Stephan N. Steinmann
- Institut des Sciences et Ingénierie Chimiques; Ecole Polytechnique Fédérale de Lausanne; 1015; Lausanne; Switzerland
| | | | - Gabriel Merino
- Departamento de Física Aplicada; Centro de Investigación de Estudios Avanzados; Mérida; Yucatán; 97310; Mexico
| | - Clemence Corminboeuf
- Institut des Sciences et Ingénierie Chimiques; Ecole Polytechnique Fédérale de Lausanne; 1015; Lausanne; Switzerland
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34
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Nelyubina YV, Lyssenko KA. Probing stereoelectronic interactions in an O-N-O unit by the atomic energies: experimental and theoretical electron density study. J Phys Chem A 2013; 117:3084-92. [PMID: 23473427 DOI: 10.1021/jp312835y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Stereoelectronic interaction lp(O1) → σ*(N1-O2) in a O-N-O unit was analyzed by means of R. Bader's Atoms in Molecule theory on the basis of X-ray diffraction data for dimethyl-(2R,4aR,5S,7R)-2,5,7-triphenylhexahydro-4H-[1,2]oxazino[2,3-b][1,2]oxazine-4,4-dicarboxylate. Atomic energies obtained by applying this approach to both the experimental and theoretical electron densities were used to probe the energy of this strong stereoelectronic interaction, giving consistent results with the NBO analysis, although showing its destabilizing character.
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Affiliation(s)
- Yulia V Nelyubina
- A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 119991, Vavilova Str., 28, Moscow, Russia.
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