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Mó O, Montero-Campillo MM, Yáñez M, Alkorta I, Elguero J. Discovering trends in the Lewis acidity of beryllium and magnesium hydrides and fluorides with increasing clusters size. J Comput Chem 2024; 45:1702-1715. [PMID: 38567760 DOI: 10.1002/jcc.27356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 03/13/2024] [Accepted: 03/18/2024] [Indexed: 06/13/2024]
Abstract
We have reported in the last years the strong effect that Be- and Mg-containing Lewis acids have on the intrinsic properties of typical bases, which become acids upon complexation. In an effort to investigate these changes when the Be and Mg derivatives form clusters of increasing size, we have examined the behavior of the (MX2)n (M = Be, Mg; X = H, F; n = 1, 2, 3) clusters when they interact with ammonia, methanimine, hydrogen cyanide and pyridine, and with their corresponding deprotonated forms. The complexes obtained at the M06-2X/aug-cc-pVTZ level were analyzed using the MBIE energy decomposition formalism, in parallel with QTAIM, ELF, NCIPLOT and AdNDP analyses of their electron density. For n = 1 the interaction enthalpy for the different families of monomers, Be (Mg) hydrides and Be (Mg) fluorides, follows the same trend as the intrinsic basicity of the base that interacts with them. This interaction is greatly reinforced after the deprotonation of the base, resulting in a significant enhancement of the intrinsic acidity of the corresponding MX2-Base complex. For (MX2)2 clusters a further reinforcement of the interaction with the base is observed, this reinforcement being again larger for the deprotonated complexes. However, the concomitant increase of their intrinsic acidity is one order of magnitude larger for hydrides than for fluorides. Unexpectedly, the cyclic conformers (MX2)3, which are more unstable than the linear ones, become the global minima after association with the base and the same is true for the deprotonated complex. Accordingly, a further increase of the intrinsic acidity of the (MX2)3-Base complexes with respect to the (MX2)2-Base ones is observed. This effect is maximum for (MgF2)3 clusters, to the point that the (MgF2)3-Base complexes become more acidic than nitric acid, the extreme case being the cluster (MgF2)3-NCH, whose acidity is higher than that of perchloric acid.
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Affiliation(s)
- Otilia Mó
- Departamento de Química, Módulo 13, Facultad de Ciencias, and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain
| | - M Merced Montero-Campillo
- Departamento de Química, Módulo 13, Facultad de Ciencias, and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain
| | - Manuel Yáñez
- Departamento de Química, Módulo 13, Facultad de Ciencias, and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain
| | - Ibon Alkorta
- Instituto de Química Médica, IQM-CSIC, Madrid, Spain
| | - José Elguero
- Instituto de Química Médica, IQM-CSIC, Madrid, Spain
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2
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Guo FK, Lu YL, Huang MY, Yang JM, Guo JL, Wan ZY, Zhu SF. Wittig/B─H insertion reaction: A unique access to trisubstituted Z-alkenes. SCIENCE ADVANCES 2023; 9:eadj2486. [PMID: 37703379 PMCID: PMC10499320 DOI: 10.1126/sciadv.adj2486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 08/11/2023] [Indexed: 09/15/2023]
Abstract
The Wittig reaction, which is one of the most effective methods for synthesizing alkenes from carbonyl compounds, generally gives thermodynamically stable E-alkenes, and synthesis of trisubstituted Z-alkenes from ketones presents notable challenges. Here, we report what we refer to as Wittig/B─H insertion reactions, which innovatively combine a Wittig reaction with carbene insertion into a B─H bond and constitute a promising method for the synthesis of thermodynamically unstable trisubstituted Z-boryl alkenes. Combined with the easy transformations of boryl group, this methodology provides efficient access to a variety of previously unavailable trisubstituted Z-alkenes and thus provides a platform for discovery of pharmaceuticals. The unique Z-selectivity of the reaction is determined by the maximum overlap of the orbitals between the B─H bond of the borane adduct and the alkylidene carbene intermediate in the transition state.
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Affiliation(s)
- Feng-Kai Guo
- Frontiers Science Center for New Organic Matter, the State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Yi-Lin Lu
- Frontiers Science Center for New Organic Matter, the State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Ming-Yao Huang
- Frontiers Science Center for New Organic Matter, the State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Ji-Min Yang
- Frontiers Science Center for New Organic Matter, the State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jia-Lei Guo
- Frontiers Science Center for New Organic Matter, the State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Zi-Yi Wan
- Frontiers Science Center for New Organic Matter, the State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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3
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Yáñez M, Ortíz-Chi F, Merino G, Alkorta I. Dismantlement of ammonia upon interaction with Be n (n ≤ 10) clusters. J Comput Chem 2023; 44:159-167. [PMID: 35297069 PMCID: PMC10078787 DOI: 10.1002/jcc.26843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 03/01/2022] [Accepted: 03/02/2022] [Indexed: 12/31/2022]
Abstract
The interaction of ammonia with Ben (n < 1-10) clusters has been investigated by density functional theory and ab initio calculations. The main conclusion is that, regardless of the size of the Be cluster, neither the structure of ammonia nor that of the Be clusters are preserved due to a systematic dissociation of its NH bonds and a spontaneous H-shift toward the available Be atoms. This H migration not only leads to rather stable BeH bonds, but dramatically enhances the strength of the BeN bonds as well. Accordingly, the maximum stability is found for the interaction with the beryllium trimer, leading to a complex with three NBe and three BeH bonds. Another maximum in stability, although lower than that reached for n = 3, is found for the Be heptamer, since from n = 6, a new NBe bond is formed, so that complexes from n = 6 to n = 10 are characterized by the formation of a NBe4 moiety, whose stability reaches a maximum at n = 7. The bonding characteristics of the different species formed are analyzed by means of AIM, NBO, ELF and AdNDP approaches.
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Affiliation(s)
- Manuel Yáñez
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain
| | - Filiberto Ortíz-Chi
- CONACYT-Universidad Juárez Autónoma de Tabasco, Centro de Investigación de Ciencia y Tecnología Aplicada de Tabasco, Cunduacán, Tabasco, Mexico
| | - Gabriel Merino
- Centro Investigación & Estudios Avanzados, Unidad Mérida, Dept. Física Aplicada, Merida, Mexico
| | - Ibon Alkorta
- Instituto de Química Médica (CSIC), Madrid, Spain
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4
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Gerschel P, Guseva T, Siegmund D, Apfel UP. Synthesis and Characterization of Phosphorus-Containing Isocyclam Macrocycles and Their Nickel Complexes. J Org Chem 2022; 87:16368-16377. [PMID: 36449039 DOI: 10.1021/acs.joc.2c02049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
The tetradentate azamacrocycle cyclam (=1,4,8,11-tetraazacyclotetradecane) was studied profoundly for the coordination of transition metal ions, and the resulting complexes were investigated extensively for their catalytic performance in, e.g., O2 activation and electrocatalytic CO2 reduction. Although the successful synthesis of analogous P4 macrocycles was described earlier, no tetradentate N,P mixed 14-membered macrocycles have been prepared to date and their chemistry remains elusive. Thus, in this work, we showcase the synthesis of phospha-aza mixed cyclam-based macrocycles by selectively "exchanging" one or two secondary amines in the macrocycle isocyclam (=1,4,7,11-tetraazacyclotetradecane) with tertiary phosphines. In addition, we herein present the preparation of the corresponding nickel complexes along with their complex chemical and structural characterization to provide first coordination studies.
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Affiliation(s)
- Philipp Gerschel
- Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße 150, Bochum 44801, Germany
| | - Tatiana Guseva
- Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße 150, Bochum 44801, Germany
| | - Daniel Siegmund
- Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße 150, Bochum 44801, Germany.,Department of Electrosynthesis, Fraunhofer UMSICHT, Osterfelder Straße 3, Oberhausen 46047, Germany
| | - Ulf-Peter Apfel
- Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße 150, Bochum 44801, Germany.,Department of Electrosynthesis, Fraunhofer UMSICHT, Osterfelder Straße 3, Oberhausen 46047, Germany
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5
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Dunaj T, Feil CM, Nieger M, Gudat D. Adducts of Diaminophosphanes with Organoboranes. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202200192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | | | | | - Dietrich Gudat
- University of Stuttgart Faculty of Chemistry: Universitat Stuttgart Fakultat Chemie Institut für Anorganische Chemie Pfaffenwaldring 55 70550 Stuttgart GERMANY
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Montero-Campillo MM, Alkorta I, Mó O, Elguero J, Yáñez M. On predicting bonding patterns of small clusters of alkaline-earth (Be, Mg) and triel (B, Al) fluorides: a balance between atomic size and electron-deficient character. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2086935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- M. Merced Montero-Campillo
- Departamento de Química, Módulo 13, Facultad de Ciencias, Institute of Advanced Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain
| | - Ibon Alkorta
- Instituto de Química Médica, IQM-CSIC, Madrid, Spain
| | - Otilia Mó
- Departamento de Química, Módulo 13, Facultad de Ciencias, Institute of Advanced Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain
| | - José Elguero
- Instituto de Química Médica, IQM-CSIC, Madrid, Spain
| | - Manuel Yáñez
- Departamento de Química, Módulo 13, Facultad de Ciencias, Institute of Advanced Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain
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7
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Montero-Campillo MM, Mó O, Alkorta I, Elguero J, Yáñez M. Disrupting bonding in azoles through beryllium bonds: Unexpected coordination patterns and acidity enhancement. J Chem Phys 2022; 156:194303. [PMID: 35597641 DOI: 10.1063/5.0089716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Although triazoles and tetrazole are amphoteric and may behave as weak acids, the latter property can be hugely enhanced by beryllium bonds. To explain this phenomenon, the structure and bonding characteristics of the complexes between triazoles and tetrazoles with one and two molecules of BeF2 have been investigated through the use of high-level G4 ab initio calculations. The formation of the complexes between the N basic sites of the azoles and the Be center of the BeF2 molecule and the (BeF2)2 dimer leads to a significant bonding perturbation of both interacting subunits. The main consequence of these electron density rearrangements is the above-mentioned increase in the intrinsic acidity of the azole subunit, evolving from a typical nitrogen base to a very strong nitrogenous acid. This effect is particularly dramatic when the interaction involves the (BeF2)2 dimer, that is, a Lewis acid much stronger than the monomer. Although the azoles investigated have neighboring N-basic sites, their interaction with the (BeF2)2 dimer yields a monodentate complex. However, the deprotonated species becomes extra-stabilized because a second N-Be bond is formed, leading to a new five-membered ring, with the result that the azole-(BeF2)2 complexes investigated become stronger nitrogenous acids than oxyacids such as perchloric acid.
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Affiliation(s)
- M Merced Montero-Campillo
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid 28049, Spain
| | - Otilia Mó
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid 28049, Spain
| | - Ibon Alkorta
- Instituto de Química Médica (CSIC), Juan de la Cierva, 3, E-28006 Madrid, Spain
| | - José Elguero
- Instituto de Química Médica (CSIC), Juan de la Cierva, 3, E-28006 Madrid, Spain
| | - Manuel Yáñez
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid 28049, Spain
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8
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Gholamirad P, Rouhani M. DFT study about the effects of BX3 (X = H, F, Cl and Br) derivatives on the C–H acidity enhancement. MAIN GROUP CHEMISTRY 2021. [DOI: 10.3233/mgc-210070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A computational study about the effect of BX3 (X = H, F, Cl and Br) interaction in C–H acidity enhancement of some aldehyde, ketone and imine molecules is performed by B3LYP/6- 311++G(d,p) method in gas phase. The boron derivatives of model molecules show more acidity in comparison with their pure forms. This acidity improvement is attributed to the effective interaction of the C = O/C = N group with the B atom of BX3. The acidity enhancement is according to the BBr3 > BCl3 > BF3 > BH3 order which shows that boron compounds with electron withdrawing groups and especially BBr3 can be used as an effective and promising C–H activator in various organic reactions.
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Affiliation(s)
- Parisa Gholamirad
- Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Morteza Rouhani
- Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
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9
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I-Ting T, Montero-Campillo MM, Alkorta I, Elguero J, Yáñez M. Large Stabilization Effects by Intramolecular Beryllium Bonds in Ortho-Benzene Derivatives. Molecules 2021; 26:molecules26113401. [PMID: 34199746 PMCID: PMC8199991 DOI: 10.3390/molecules26113401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 05/31/2021] [Accepted: 06/01/2021] [Indexed: 11/16/2022] Open
Abstract
Intramolecular interactions are shown to be key for favoring a given structure in systems with a variety of conformers. In ortho-substituted benzene derivatives including a beryllium moiety, beryllium bonds provide very large stabilizations with respect to non-bound conformers and enthalpy differences above one hundred kJ·mol−1 are found in the most favorable cases, especially if the newly formed rings are five or six-membered heterocycles. These values are in general significantly larger than hydrogen bonds in 1,2-dihidroxybenzene. Conformers stabilized by a beryllium bond exhibit the typical features of this non-covalent interaction, such as the presence of a bond critical point according to the topology of the electron density, positive Laplacian values, significant geometrical distortions and strong interaction energies between the donor and acceptor quantified by using the Natural Bond Orbital approach. An isodesmic reaction scheme is used as a tool to measure the strength of the beryllium bond in these systems in terms of isodesmic energies (analogous to binding energies), interaction energies and deformation energies. This approach shows that a huge amount of energy is spent on deforming the donor–acceptor pairs to form the new rings.
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Affiliation(s)
- Tsai I-Ting
- Departamento de Química, Módulo 13, Facultad de Ciencias, and Institute of Advanced Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain;
| | - M. Merced Montero-Campillo
- Departamento de Química, Módulo 13, Facultad de Ciencias, and Institute of Advanced Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain;
- Correspondence: (M.M.M.-C.); (I.A.); (M.Y.)
| | - Ibon Alkorta
- Instituto de Química Médica, IQM-CSIC, Juan de la Cierva, 3, 28006 Madrid, Spain;
- Correspondence: (M.M.M.-C.); (I.A.); (M.Y.)
| | - José Elguero
- Instituto de Química Médica, IQM-CSIC, Juan de la Cierva, 3, 28006 Madrid, Spain;
| | - Manuel Yáñez
- Departamento de Química, Módulo 13, Facultad de Ciencias, and Institute of Advanced Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain;
- Correspondence: (M.M.M.-C.); (I.A.); (M.Y.)
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10
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Hettich TD, Rudolf R, Feil CM, Birchall N, Nieger M, Gudat D. Synthesis and Ambiphilic Reactivity of Metalated Diorgano-Phosphonite Boranes. Chemistry 2021; 27:5412-5416. [PMID: 33497004 PMCID: PMC8048877 DOI: 10.1002/chem.202005437] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Indexed: 11/09/2022]
Abstract
Unprecedented metalated phosphonite boranes were prepared from PH‐substituted precursors and silyl amides. Although potassium derivatives were thermally stable and could even be isolated and structurally characterised, lithiated analogues proved to be unstable towards self‐condensation under cleavage of LiOR at ambient temperature. Reaction studies revealed that the metalated phosphonite boranes exhibit ambiphilic character. Their synthetic potential as nucleophilic building blocks was demonstrated in the synthesis of the first stannylated phosphonite representing a new structural motif in phosphine chemistry.
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Affiliation(s)
- Thomas D Hettich
- Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550, Stuttgart, Germany
| | - Richard Rudolf
- Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550, Stuttgart, Germany
| | - Christoph M Feil
- Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550, Stuttgart, Germany
| | - Nicholas Birchall
- Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550, Stuttgart, Germany
| | - Martin Nieger
- Department of Chemistry, University of Helsinki, P.O Box 55, 00014, Helsinki, Finland
| | - Dietrich Gudat
- Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550, Stuttgart, Germany
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11
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Valadbeigi Y, Gal JF. Organometallic superacids and hyperacids: Acidity enhancement by internal bonding with a strong electron-pair acceptor group BX2. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2020.138207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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12
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de Jong GB, Ortega N, Lutz M, Lammertsma K, Slootweg JC. Easy Access to Phosphine-Borane Building Blocks. Chemistry 2020; 26:15944-15952. [PMID: 32602582 PMCID: PMC7756754 DOI: 10.1002/chem.202002367] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 06/29/2020] [Indexed: 11/26/2022]
Abstract
In this paper, we highlight the synthesis of a variety of primary phosphine-boranes (RPH2 ⋅BH3 ) from the corresponding dichlorophosphines, simply by using Li[BH4 ] as reductant and provider of the BH3 protecting group. The method offers facile access not only to alkyl- and arylphosphine-boranes, but also to aminophosphine-boranes (R2 NPH2 ⋅BH3 ) that are convenient building blocks but without the protecting BH3 moiety thermally labile and notoriously difficult to handle. The borane-protected primary phosphines can be doubly deprotonated using n-butyllithium to provide soluble phosphanediides Li2 [RP⋅BH3 ] of which the phenyl-derivative Li2 [PhP⋅BH3 ] was structurally characterized in the solid state.
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Affiliation(s)
- G. Bas de Jong
- Van't Hoff Institute for Molecular Sciences (HIMS)University of AmsterdamP.O. Box 941571090 GDAmsterdamThe Netherlands
- Faculty of SciencesVrije Universiteit AmsterdamDe Boelelaan 10831081 HVAmsterdamThe Netherlands
| | - Nuria Ortega
- Faculty of SciencesVrije Universiteit AmsterdamDe Boelelaan 10831081 HVAmsterdamThe Netherlands
| | - Martin Lutz
- Crystal and Structural ChemistryBijvoet Centre for Biomolecular ResearchUtrecht UniversityPadualaan 83584UtrechtThe Netherlands
| | - Koop Lammertsma
- Faculty of SciencesVrije Universiteit AmsterdamDe Boelelaan 10831081 HVAmsterdamThe Netherlands
- Department of ChemistryOakland Park 2006University of JohannesburgJohannesburg2006South Africa
| | - J. Chris Slootweg
- Van't Hoff Institute for Molecular Sciences (HIMS)University of AmsterdamP.O. Box 941571090 GDAmsterdamThe Netherlands
- Faculty of SciencesVrije Universiteit AmsterdamDe Boelelaan 10831081 HVAmsterdamThe Netherlands
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13
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Blum M, Dunaj T, Knöller JA, Feil CM, Nieger M, Gudat D. Isolable Diaminophosphide Boranes. Chemistry 2020; 26:15190-15199. [PMID: 32567741 PMCID: PMC7756230 DOI: 10.1002/chem.202002296] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 06/18/2020] [Indexed: 11/30/2022]
Abstract
Metalation of secondary diaminophosphine boranes by alkali metal amides provides a robust and selective access route to a range of metal diaminophosphide boranes M[(R2N)2P(BH3)] (M=Li, Na, K; R=alkyl, aryl) with acyclic or heterocyclic molecular backbones, whereas reduction of a chlorodiaminophosphine borane gave less satisfactory results. The metalated species were characterized in situ by NMR spectroscopy and in two cases isolated as crystalline solids. Single‐crystal XRD studies revealed the presence of salt‐like structures with strongly interacting ions. Synthetic applications of K[(R2N)2P(BH3)] were studied in reactions with a 1,2‐dichlorodisilane and CS2, which afforded either mono‐ or difunctional phosphine boranes with a rare combination of electronegative amino and electropositive functional disilanyl groups on phosphorus, or a phosphinodithioformate. Spectroscopic studies gave a first hint that removal of the borane fragment may be feasible.
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Affiliation(s)
- Markus Blum
- Institute of Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70550, Stuttgart, Germany
| | - Tobias Dunaj
- Institute of Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70550, Stuttgart, Germany
| | - Julius A Knöller
- Institute of Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70550, Stuttgart, Germany
| | - Christoph M Feil
- Institute of Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70550, Stuttgart, Germany
| | - Martin Nieger
- Department of Chemistry, University of Helsinki, P.O Box 55, 00014 University of, Helsinki, Finland
| | - Dietrich Gudat
- Institute of Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70550, Stuttgart, Germany
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14
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Abstract
AbstractIn this short review, different phenomena that are triggered by the interaction of different compounds or clusters of compounds with electron-deficient systems, in particular beryllium and boron compounds, have been discussed in some detail. Particular attention was devoted to the huge acidity enhancements that can be induced through the interaction of conventional bases with B or Be containing compounds, which change these conventional bases in extremely strong proton donors. We have paid also attention to the cooperativity between Be bonds with other weak interactions, which results in a substantial increase of their strength, that can lead in some specific cases to the spontaneous formation of ion-pairs in the gas phase. Finally, the behavior of different Be derivatives as electron and anion sponges is discussed as well as the conditions needed to have clusters exhibiting rather strong Be–Be bonds, even though the Be–Be interaction in Be2 dimer is extremely weak. Finally, some attention was paid to systems with extremely short Be–Be distances but without a bond.
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Affiliation(s)
- Otilia Mó
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute of Advanced Chemical Sciences (IadChem), Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain
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15
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Mó O, Montero‐Campillo MM, Alkorta I, Elguero J, Yáñez M. Ternary Complexes Stabilized by Chalcogen and Alkaline‐Earth Bonds: Crucial Role of Cooperativity and Secondary Noncovalent Interactions. Chemistry 2019; 25:11688-11695. [DOI: 10.1002/chem.201901641] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 05/31/2019] [Indexed: 01/20/2023]
Affiliation(s)
- Otilia Mó
- Departamento de Química, Módulo 13 Facultad de Ciencias and Institute of, Advanced Chemical Sciences (IadChem) Universidad Autónoma de Madrid Campus de Excelencia UAM-CSIC Cantoblanco 28049 Madrid Spain
| | - M. Merced Montero‐Campillo
- Departamento de Química, Módulo 13 Facultad de Ciencias and Institute of, Advanced Chemical Sciences (IadChem) Universidad Autónoma de Madrid Campus de Excelencia UAM-CSIC Cantoblanco 28049 Madrid Spain
| | - Ibon Alkorta
- Instituto de Química Médica, IQM-CSIC Juan de la Cierva, 3 E-28006 Madrid Spain
| | - José Elguero
- Instituto de Química Médica, IQM-CSIC Juan de la Cierva, 3 E-28006 Madrid Spain
| | - Manuel Yáñez
- Departamento de Química, Módulo 13 Facultad de Ciencias and Institute of, Advanced Chemical Sciences (IadChem) Universidad Autónoma de Madrid Campus de Excelencia UAM-CSIC Cantoblanco 28049 Madrid Spain
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16
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Valadbeigi Y, Vianello R. A density functional theory study on the superacidity of sulfuric, fluorosulfuric, and triflic acid derivatives with two cyclopentadiene rings: ion pairs formation in the gas phase. J PHYS ORG CHEM 2019. [DOI: 10.1002/poc.3995] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Younes Valadbeigi
- Department of Chemistry, Faculty of ScienceImam Khomeini International University Qazvin Iran
| | - Robert Vianello
- Computational Organic Chemistry and Biochemistry Group, Division of Organic Chemistry and BiochemistryRuđer Bošković Institute Zagreb Croatia
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17
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18
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Montero-Campillo MM, Brea O, Mó O, Alkorta I, Elguero J, Yáñez M. Modulating the intrinsic reactivity of molecules through non-covalent interactions. Phys Chem Chem Phys 2019; 21:2222-2233. [DOI: 10.1039/c8cp06908e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Non-covalent interactions as tools for modifying molecular properties.
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Affiliation(s)
- M. Merced Montero-Campillo
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute of Advanced Chemical Sciences (IadChem), Universidad Autónoma de Madrid
- Campus de Excelencia UAM-CSIC
- 28049-Madrid
- Spain
| | - Oriana Brea
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University
- Stockholm
- Sweden
| | - Otilia Mó
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute of Advanced Chemical Sciences (IadChem), Universidad Autónoma de Madrid
- Campus de Excelencia UAM-CSIC
- 28049-Madrid
- Spain
| | - Ibon Alkorta
- Instituto de Química Médica, IQM-CSIC
- E-28006 Madrid
- Spain
| | - José Elguero
- Instituto de Química Médica, IQM-CSIC
- E-28006 Madrid
- Spain
| | - Manuel Yáñez
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute of Advanced Chemical Sciences (IadChem), Universidad Autónoma de Madrid
- Campus de Excelencia UAM-CSIC
- 28049-Madrid
- Spain
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19
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Intramolecular magnesium bonds in malonaldehyde-like systems: a critical view of the resonance-assisted phenomena. Theor Chem Acc 2018. [DOI: 10.1007/s00214-018-2274-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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20
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Rinehart NI, Kendall AJ, Tyler DR. A Universally Applicable Methodology for the Gram-Scale Synthesis of Primary, Secondary, and Tertiary Phosphines. Organometallics 2018. [DOI: 10.1021/acs.organomet.7b00684] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- N. Ian Rinehart
- Department of Chemistry and Biochemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Alexander J. Kendall
- Department of Chemistry and Biochemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - David R. Tyler
- Department of Chemistry and Biochemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
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21
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Cavaye H, Clegg F, Gould PJ, Ladyman MK, Temple T, Dossi E. Primary Alkylphosphine–Borane Polymers: Synthesis, Low Glass Transition Temperature, and a Predictive Capability Thereof. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b02030] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hamish Cavaye
- Centre for Defence
Chemistry, Cranfield University, Defence Academy of United Kingdom, Shrivenham SN6 8LA, U.K
| | - Francis Clegg
- Materials and Engineering Research Institute, Sheffield Hallam University, City Campus, Howard Street, Sheffield S1 1WB, U.K
| | - Peter J. Gould
- QinetiQ, B240, Bristol Business Park, Coldharbour Lane, Bristol BS16 1FJ, U.K
| | - Melissa K. Ladyman
- Centre for Defence
Chemistry, Cranfield University, Defence Academy of United Kingdom, Shrivenham SN6 8LA, U.K
| | - Tracey Temple
- Centre for Defence
Chemistry, Cranfield University, Defence Academy of United Kingdom, Shrivenham SN6 8LA, U.K
| | - Eleftheria Dossi
- Centre for Defence
Chemistry, Cranfield University, Defence Academy of United Kingdom, Shrivenham SN6 8LA, U.K
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22
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Reactivity of cyrhetrenylphosphines: Synthesis and characterization of oxides, boranes and selenides. INORG CHEM COMMUN 2017. [DOI: 10.1016/j.inoche.2017.01.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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23
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Kögel JF, Linder T, Schröder FG, Sundermeyer J, Goll SK, Himmel D, Krossing I, Kütt K, Saame J, Leito I. Fluoro- and Perfluoralkylsulfonylpentafluoroanilides: Synthesis and Characterization of NH Acids for Weakly Coordinating Anions and Their Gas-Phase and Solution Acidities. Chemistry 2015; 21:5769-82. [DOI: 10.1002/chem.201405391] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Indexed: 11/07/2022]
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24
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Lloyd-Jones GC, Taylor NP. Mechanism of phosphine borane deprotection with amines: the effects of phosphine, solvent and amine on rate and efficiency. Chemistry 2015; 21:5423-8. [PMID: 25704230 DOI: 10.1002/chem.201406585] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2014] [Indexed: 11/07/2022]
Abstract
The kinetics of borane transfer from simple tertiary phosphine borane adducts to a wide range of amines have been determined. All data obtained, including second-order kinetics, lack of cross-over, and negative entropies of activation for reaction of triphenylphosphine borane with quinuclidine and triethylamine, are consistent with a direct (SN 2-like) transfer process, rather than a dissociative (SN 1-like) process. The identities of the amine, phosphine, and solvent all impact substantially on the rate (k) and equilibrium (K) of the transfer, which in some cases vary by many orders of magnitude. P-to-N transfer is more efficient with cyclic amines in apolar solvents due to reduced entropic costs and ground-state destabilisation. Taken as a whole, the data allow informed optimisation of the deprotection step from the stand-point of rate, or synthetic convenience. In all cases, both reactants should be present at high initial concentration to gain kinetic benefit from the bimolecularity of the process. Ultimately, the choice of amine is dictated by the identity of the phosphine borane complex. Aryl-rich phosphine boranes are sufficiently reactive to allow use of diethylamine or pyrrolidine as a volatile low polarity solvent and reactant, whereas more alkyl-rich phosphines benefit from the use of more reactive amines, such as 1,4-diaza[2.2.2]bicyclooctane (DABCO), in apolar solvents at higher temperatures.
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Affiliation(s)
- Guy C Lloyd-Jones
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ (UK).
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25
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Martín-Sómer A, Mó O, Yáñez M, Guillemin JC. Acidity enhancement of unsaturated bases of group 15 by association with borane and beryllium dihydride. Unexpected boron and beryllium Brønsted acids. Dalton Trans 2015; 44:1193-202. [DOI: 10.1039/c4dt02292k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
BeH2and BH3association with unsaturated bases of group 15 increases their acidity and changes the trend. Ethynyl : BeH2complexes unexpectedly behave as Be acids.
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Affiliation(s)
- Ana Martín-Sómer
- Departamento de Química
- Facultad de Ciencias
- Módulo 13
- Universidad Autónoma de Madrid
- 28049 Madrid
| | - Otilia Mó
- Departamento de Química
- Facultad de Ciencias
- Módulo 13
- Universidad Autónoma de Madrid
- 28049 Madrid
| | - Manuel Yáñez
- Departamento de Química
- Facultad de Ciencias
- Módulo 13
- Universidad Autónoma de Madrid
- 28049 Madrid
| | - Jean-Claude Guillemin
- Institut des Sciences Chimiques de Rennes
- École Nationale Supérieure de Chimie de Rennes
- CNRS
- UMR 6226
- 35708 Rennes Cedex 7
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26
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Pandey S, Lönnecke P, Hey-Hawkins E. Cross-dehydrocoupling: A Novel Synthetic Route to P–B–P–B Chains. Inorg Chem 2014; 53:8242-9. [DOI: 10.1021/ic500316w] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Souvik Pandey
- Institut für Anorganische Chemie, Fakultät für
Chemie und Mineralogie, Universität Leipzig, Johannisallee
29, 04103 Leipzig, Germany
| | - Peter Lönnecke
- Institut für Anorganische Chemie, Fakultät für
Chemie und Mineralogie, Universität Leipzig, Johannisallee
29, 04103 Leipzig, Germany
| | - Evamarie Hey-Hawkins
- Institut für Anorganische Chemie, Fakultät für
Chemie und Mineralogie, Universität Leipzig, Johannisallee
29, 04103 Leipzig, Germany
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27
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Mykolayivna-Lemishko K, Montero-Campillo MM, Mó O, Yáñez M. Behavior of Carboxylic Acids upon Complexation with Beryllium Compounds. J Phys Chem A 2014; 118:5720-6. [DOI: 10.1021/jp504405r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Kateryna Mykolayivna-Lemishko
- Departamento de
Química,
Facultad de Ciencias, Módulo 13 Universidad Autónoma de Madrid Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain
| | - M. Merced Montero-Campillo
- Departamento de
Química,
Facultad de Ciencias, Módulo 13 Universidad Autónoma de Madrid Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain
| | - Otilia Mó
- Departamento de
Química,
Facultad de Ciencias, Módulo 13 Universidad Autónoma de Madrid Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain
| | - Manuel Yáñez
- Departamento de
Química,
Facultad de Ciencias, Módulo 13 Universidad Autónoma de Madrid Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain
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28
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Martín-Sómer A, Mó O, Yáñez M. Are Boryl Radicals from Amine-Boranes and Phosphine-Boranes the Most Stable Radicals? Chemphyschem 2014; 15:2288-94. [DOI: 10.1002/cphc.201402060] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Indexed: 11/08/2022]
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29
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Montero-Campillo MM, Yáñez M, Lamsabhi AM, Mó O. Spontaneous H2Loss through the Interaction of Squaric Acid Derivatives and BeH2. Chemistry 2014; 20:5309-16. [DOI: 10.1002/chem.201304259] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Indexed: 12/20/2022]
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30
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P-substituted phosphine–boranes: Gas phase acidities, basicities and dihydrogen release. A comparison to amine–boranes. COMPUT THEOR CHEM 2014. [DOI: 10.1016/j.comptc.2014.01.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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32
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33
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Gas phase acidities of N-substituted amine-boranes. J Mol Model 2013; 19:5089-95. [DOI: 10.1007/s00894-013-2001-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Accepted: 09/08/2013] [Indexed: 10/26/2022]
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34
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Yáñez M, Mó O, Alkorta I, Elguero J. Can Conventional Bases and Unsaturated Hydrocarbons Be Converted into Gas-Phase Superacids That Are Stronger than Most of the Known Oxyacids? The Role of Beryllium Bonds. Chemistry 2013; 19:11637-43. [DOI: 10.1002/chem.201300808] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 05/30/2013] [Indexed: 11/08/2022]
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35
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Guerrero A, Baer T, Chana A, González J, Dávalos JZ. Gas Phase Acidity Measurement of Local Acidic Groups in Multifunctional Species: Controlling the Binding Sites in Hydroxycinnamic Acids. J Am Chem Soc 2013; 135:9681-90. [DOI: 10.1021/ja400571r] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andres Guerrero
- Instituto
de Química Física “Rocasolano”, CSIC, C Serrano 119, Madrid, E-28006, Spain
| | - Tomas Baer
- Instituto
de Química Física “Rocasolano”, CSIC, C Serrano 119, Madrid, E-28006, Spain
| | - Antonio Chana
- Instituto
de Química Física “Rocasolano”, CSIC, C Serrano 119, Madrid, E-28006, Spain
| | - Javier González
- Instituto
de Química Física “Rocasolano”, CSIC, C Serrano 119, Madrid, E-28006, Spain
| | - Juan Z. Dávalos
- Instituto
de Química Física “Rocasolano”, CSIC, C Serrano 119, Madrid, E-28006, Spain
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36
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Miesel D, Hildebrandt A, Korb M, Low PJ, Lang H. Synthesis and (Spectro)electrochemical Behavior of 2,5-Diferrocenyl-1-phenyl-1H-phosphole. Organometallics 2013. [DOI: 10.1021/om400201b] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dominique Miesel
- Technische Universität Chemnitz, Faculty
of Natural Sciences, Institute of Chemistry, Inorganic
Chemistry, Straße der Nationen 62, 09111 Chemnitz, Germany
| | - Alexander Hildebrandt
- Technische Universität Chemnitz, Faculty
of Natural Sciences, Institute of Chemistry, Inorganic
Chemistry, Straße der Nationen 62, 09111 Chemnitz, Germany
| | - Marcus Korb
- Technische Universität Chemnitz, Faculty
of Natural Sciences, Institute of Chemistry, Inorganic
Chemistry, Straße der Nationen 62, 09111 Chemnitz, Germany
| | - Paul J. Low
- Durham University, Department of Chemistry, South Road, Durham DH1 3LE, U.K
| | - Heinrich Lang
- Technische Universität Chemnitz, Faculty
of Natural Sciences, Institute of Chemistry, Inorganic
Chemistry, Straße der Nationen 62, 09111 Chemnitz, Germany
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37
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Gas phase Lewis acidity and basicity scales for boranes, phosphines and amines based on the formation of donor–acceptor complexes. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.02.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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38
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Mó O, Yáñez M, Alkorta I, Elguero J. Enhancing and modulating the intrinsic acidity of imidazole and pyrazole through beryllium bonds. J Mol Model 2013; 19:4139-45. [PMID: 23292320 DOI: 10.1007/s00894-012-1682-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 11/06/2012] [Indexed: 11/30/2022]
Abstract
The structure and electronic properties of the complexes formed by the interaction of imidazole and pyrazole with different BeXH(BeX2) (X = H, Me, F, Cl) derivatives have been investigated via B3LYP/6-311+G(3df,2p)//B3LYP/6-31+G(d,p) calculations. The formation of these azole:BeXH(BeX2) complexes is accompanied by a dramatic enhancement of the intrinsic acidity of the azole, as the deprotonated azole is much more stable after the aforementioned interaction. Most importantly, the increase in acidity is so large that the azole:BeXH or azole:BeX2 complexes behave as NH acids, which are stronger than typical oxyacids such as phosphoric acid and oxalic acid. Interestingly, the increase in acidity can be tuned through appropriate selection of the substituents attached to the Be atom, permitting us to modulate the electron-accepting ability of the BeXH or BeX2 molecule.
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Affiliation(s)
- Otilia Mó
- Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049, Madrid, Spain
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39
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Martín-Sómer A, Lamsabhi AM, Yáñez M, Dávalos JZ, González J, Ramos R, Guillemin JC. Can an Amine Be a Stronger Acid than a Carboxylic Acid? The Surprisingly High Acidity of Amine-Borane Complexes. Chemistry 2012; 18:15699-705. [DOI: 10.1002/chem.201202192] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Indexed: 11/08/2022]
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40
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Modulating weak intramolecular interactions through the formation of beryllium bonds: complexes between squaric acid and BeH2. J Mol Model 2012; 19:2759-66. [PMID: 23053013 DOI: 10.1007/s00894-012-1603-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Accepted: 09/21/2012] [Indexed: 10/27/2022]
Abstract
The electronic structure of the two most stable isomers of squaric acid and their complexes with BeH2 were investigated at the B3LYP/6-311 + G(3df,2p)// B3LYP/6-31 + G(d,p) level of theory. Squaric acid forms rather strong beryllium bonds with BeH2, with binding energies of the order of 60 kJ mol(-1). The preferential sites for BeH2 attachment are the carbonyl oxygen atoms, but the global minima of the potential energy surfaces of both EZ and ZZ isomers are extra-stabilized through the formation of a BeH···HO dihydrogen bond. More importantly, analysis of the electron density of these complexes shows the existence of significant cooperative effects between the beryllium bond and the dihydrogen bond, with both becoming significantly reinforced. The charge transfer involved in the formation of the beryllium bond induces a significant electron density redistribution within the squaric acid subunit, affecting not only the carbonyl group interacting with the BeH2 moiety but significantly increasing the electron delocalization within the four membered ring. Accordingly the intrinsic properties of squaric acid become perturbed, as reflected in its ability to self-associate.
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41
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Martín-Sómer A, Lamsabhi AM, Mó O, Yáñez M. Unexpected acidity enhancement triggered by AlH3 association to phosphines. J Phys Chem A 2012; 116:6950-4. [PMID: 22630168 DOI: 10.1021/jp304186m] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The complexes formed by the interaction between a series of phosphines R-PH(2) (R = H, CH(3), c-C(3)H(5), C(6)H(5)) and AlH(3) have been investigated through the use of high-level G4 ab initio calculations. These very stable complexes behave as much stronger acids than the isolated phosphines. This dramatic acidity enhancement, which can be as high as 174 kJ mol(-1), results from a much greater stabilization of the anionic deprotonated species with respect to the neutral one, upon AlH(3) association. This effect depends quantitatively on the nature of the substituent R and is smaller for R = C(6)H(5) because of the conjugation of the P lone pair with the aromatic system. More unexpectedly, however, the phosphine-alane complexes, RPH(2):AlH(3), are more acidic than the corresponding phosphine-borane RPH(2):BH(3) analogues. This unexpected result is due to the enhanced stability of the anionic deprotonated species for complexes involving AlH(3), because the delocalization of the newly created P lone pair with the P-Al bonding density is more favorable when the Lewis acid is aluminum trihydride than when it is borane.
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Affiliation(s)
- Ana Martín-Sómer
- Departamento de Química, Facultad de Ciencias, Módulo 13, Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049-Madrid, Spain
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42
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Abboud JLM, Németh B, Guillemin JC, Burk P, Adamson A, Nerut ER. Dihydrogen Generation from Amine/Boranes: Synthesis, FT-ICR, and Computational Studies. Chemistry 2012; 18:3981-91. [DOI: 10.1002/chem.201102611] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Revised: 11/20/2011] [Indexed: 11/06/2022]
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43
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Motiyenko RA, Margulès L, Guillemin JC. High Resolution Millimeter-Wave Spectroscopy of Cyclopropylphosphine–Borane. J Phys Chem A 2012; 116:1565-70. [DOI: 10.1021/jp211611t] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Roman A. Motiyenko
- Laboratoire de Physique des
Lasers, Atomes et Molécules, UMR CNRS 8523, Université de Lille 1, F-59655 Villeneuve d’Ascq,
France
| | - Laurent Margulès
- Laboratoire de Physique des
Lasers, Atomes et Molécules, UMR CNRS 8523, Université de Lille 1, F-59655 Villeneuve d’Ascq,
France
| | - Jean-Claude Guillemin
- École Nationale
Supérieure
de Chimie de Rennes, CNRS, UMR 6226, Avenue
du Général Leclerc, CS 50837, 35708 Rennes Cedex 7,
France
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44
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Vianello R, Maksić ZB. Polycyano Derivatives of some Organic Tri- and Hexacyclic Molecules Are Powerful Super- and Hyperacids in the Gas Phase and DMSO: Computational Study by DFT Approach. J Org Chem 2010; 75:7670-81. [DOI: 10.1021/jo101581a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Robert Vianello
- Quantum Organic Chemistry Group, Ruđer, Bošković Institute, Bijenička 54, HR-10000 Zagreb, Croatia
- Laboratory for Biocomputing and Bioinformatics, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
| | - Zvonimir B. Maksić
- Quantum Organic Chemistry Group, Ruđer, Bošković Institute, Bijenička 54, HR-10000 Zagreb, Croatia
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45
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Hurtado M, Mó O, Yáñez M. Homoselenocysteine — An oxygen or selenium acid in the gas phase? CAN J CHEM 2010. [DOI: 10.1139/v10-034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The potential energy surface of l-homoselenocysteine (HSEC) has been explored through the use of B3LYP/6-311+G(d,p) calculations. In this survey, seventy-seven different conformers have been located. These local minima can be classified in four groups, A–D. Structures A, B, and D are stabilized by intramolecular hydrogen bonds (IMHBs) with the amino group acting as the hydrogen bond (HB) donor and the carbonyl group (structures A and D) or the hydroxyl group (structure B) as HB acceptors. The structures in set C present an IMHB with the amino group acting as the HB acceptor and the hydroxyl group as the HB donor. The stability order decreases in the following order: A > B > C > D. From their relative stabilities it can be concluded that only three of these conformers, namely A1, A4, and A5, would exist in the gas phase at room temperature. The most stable deprotonated form corresponds to a Se-deprotated species stabilized by a strong IMHB between the hydroxyl group and the Se atom. However, a direct deprotonation of the most stable neutrals lead to O-deprotonated species, which eventually isomerize to yield the global minimum. Hence, we can conclude that, quite unexpectedly, HSEC behaves as a Se acid in the gas phase, its intrinsic acidity being 1374 kJ mol–1at the B3LYP/6-311++G(3df,2p) level of theory. The most stable protonated forms are systematically the N-protonated ones, the global minimum being a structure stabilized through an IMHB involving the protonated amino group as the HB donor and the SeH group as the HB acceptor. The calculated gas-phase proton affinity (PA) at the B3LYP/6-311++G(3df,2p) level of theory is 930 kJ mol–1.
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Affiliation(s)
- Marcela Hurtado
- Departamento de Química, C-9, Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049-Madrid, Spain
| | - Otilia Mó
- Departamento de Química, C-9, Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049-Madrid, Spain
| | - Manuel Yáñez
- Departamento de Química, C-9, Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049-Madrid, Spain
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Staubitz A, Robertson APM, Sloan ME, Manners I. Amine− and Phosphine−Borane Adducts: New Interest in Old Molecules. Chem Rev 2010; 110:4023-78. [DOI: 10.1021/cr100105a] [Citation(s) in RCA: 554] [Impact Index Per Article: 39.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Anne Staubitz
- School of Chemistry, University of Bristol, Bristol, U.K., BS8 1TS
| | | | - Matthew E. Sloan
- School of Chemistry, University of Bristol, Bristol, U.K., BS8 1TS
| | - Ian Manners
- School of Chemistry, University of Bristol, Bristol, U.K., BS8 1TS
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Németh B, Khater B, Guillemin JC, Veszprémi T. Differences Between Amine- and Phosphine-Boranes: Synthesis, Photoelectron Spectroscopy, and Quantum Chemical Study of the Cyclopropylic Derivatives. Inorg Chem 2010; 49:4854-64. [DOI: 10.1021/ic902180p] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Balázs Németh
- Sciences Chimiques de Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, Avenue du Général Leclerc, CS 50837, 35708 Rennes Cedex 7, France
- Budapest University of Technology and Economics, Department of Inorganic and Analytical Chemistry, Budapest, Pf. 91, H-1521, Hungary
| | - Brahim Khater
- Sciences Chimiques de Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, Avenue du Général Leclerc, CS 50837, 35708 Rennes Cedex 7, France
| | - Jean-Claude Guillemin
- Sciences Chimiques de Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, Avenue du Général Leclerc, CS 50837, 35708 Rennes Cedex 7, France
| | - Tamás Veszprémi
- Budapest University of Technology and Economics, Department of Inorganic and Analytical Chemistry, Budapest, Pf. 91, H-1521, Hungary
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Németh B, Khater B, Veszprémi T, Guillemin JC. Synthesis, photoelectron spectroscopy and quantum chemical study of kinetically unstabilized phosphines complexed by borane. Dalton Trans 2009:3526-35. [DOI: 10.1039/b823186a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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