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Kulsha AV, Ragoyja EG, Ivashkevich OA. Strong Bases Design: Predicted Limits of Basicity. J Phys Chem A 2022; 126:3642-3652. [PMID: 35657384 DOI: 10.1021/acs.jpca.2c00521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Brønsted superbases have wide applications in organic chemistry due to their ability to activate C-H bonds. The strongest neutral bases to date are substituted aminophosphazenes developed in the late 1980s by Reinhard Schwesinger. Since then, much effort has been expended to create even stronger neutral bases. In this article, the reasons for the instability of very basic compounds are investigated by means of high-level quantum-chemical calculations. Theoretical basicity limits are suggested for solutions as well as for the gas phase. A record-breaking superbase most likely to be synthesizable and stable at ambient conditions is proposed. Hexamethylphosphoramide is considered a reliable ionizing solvent for superbases.
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Affiliation(s)
- Andrey V Kulsha
- Chemical Department, Belarusian State University, 4 Nezavisimosti Avenue, 220030 Minsk, Republic of Belarus
| | - Ekaterina G Ragoyja
- Chemical Department, Belarusian State University, 4 Nezavisimosti Avenue, 220030 Minsk, Republic of Belarus
| | - Oleg A Ivashkevich
- Laboratory for Chemistry of Condensed Systems, Research Institute for Physical Chemical Problems of the Belarusian State University, 14 Leningradskaya Street, 220006 Minsk, Republic of Belarus
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2
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Ranga PK, Ahmad F, Singh G, Tyagi A, Vijaya Anand R. Recent advances in the organocatalytic applications of cyclopropene- and cyclopropenium-based small molecules. Org Biomol Chem 2021; 19:9541-9564. [PMID: 34704583 DOI: 10.1039/d1ob01549d] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The development of novel small molecule-based catalysts for organic transformations has increased noticeably in the last two decades. A very recent addition to this particular research area is cyclopropene- and cyclopropenium-based catalysts. At one point in time, particularly in the mid-20th century, much attention was focused on the structural aspects and physical properties of cyclopropene-based compounds. However, a paradigm shift was observed in the late 20th century, and the focus shifted to the synthetic utility of these compounds. In fact, a wide range of cyclopropene derivatives have been found serving as valuable synthons for the construction of carbocycles, heterocycles and other useful organic compounds. In the last few years, the catalytic applications of cyclopropene/cyclopropenium-based compounds have been uncovered and many synthetic protocols have been developed using cyclopropene-based compounds as organocatalysts. Therefore, the main objective of this review is to highlight recent developments in the catalytic applications of cyclopropene-based small molecules in different areas of organocatalysis such as phase-transfer catalysis (PTC), Brønsted base catalysis, hydrogen-bond donor catalysis, nucleophilic carbene catalysis, and electrophotocatalysis developed within the past two decades.
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Affiliation(s)
- Pavit K Ranga
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
| | - Feroz Ahmad
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
| | - Gurdeep Singh
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
| | - Akshi Tyagi
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
| | - Ramasamy Vijaya Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
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3
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Push–Pull Effect on the Gas-Phase Basicity of Nitriles: Transmission of the Resonance Effects by Methylenecyclopropene and Cyclopropenimine π-Systems Substituted by Two Identical Strong Electron Donors. Symmetry (Basel) 2021. [DOI: 10.3390/sym13091554] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The gas-phase basicity of nitriles can be enhanced by a push–pull effect. The role of the intercalated scaffold between the pushing group (electron-donor) and the pulling (electron-acceptor) nitrile group is crucial in the basicity enhancement, simultaneously having a transmission function and an intrinsic contribution to the basicity. In this study, we examine the methylenecyclopropene and the N-analog, cyclopropenimine, as the smallest cyclic π systems that can be considered for resonance propagation in a push–pull system, as well as their derivatives possessing two strong pushing groups (X) attached symmetrically to the cyclopropene scaffold. For basicity and push–pull effect investigations, we apply theoretical methods (DFT and G2). The effects of geometrical and rotational isomerism on the basicity are explored. We establish that the protonation of the cyano group is always favored. The push–pull effect of strong electron donor X substituents is very similar and the two π-systems appear to be good relays for this effect. The effects of groups in the two cyclopropene series are found to be proportional to the effects in the directly substituted nitrile series X–C≡N. In parallel to the basicity, changes in electron delocalization caused by protonation are also assessed on the basis of aromaticity indices. The calculated proton affinities of the nitrile series reported in this study enrich the gas-phase basicity scale of nitriles to around 1000 kJ mol−1.
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Guest M, Mir R, Foran G, Hickson B, Necakov A, Dudding T. Trisaminocyclopropenium Cations as Small-Molecule Organic Fluorophores: Design Guidelines and Bioimaging Applications. J Org Chem 2020; 85:13997-14011. [PMID: 32930593 DOI: 10.1021/acs.joc.0c02026] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The discovery of fluorescence two centuries ago ushered in, what is today, an illuminating field of science rooted in the rational design of photochromic molecules for task-specific bio-, material-, and medical-driven applications. Today, this includes applications in bioimaging and diagnosis, photodynamic therapy regimes, in addition to photovoltaic devices and solar cells, among a vast multitude of other usages. In furthering this indispensable area of daily life and modern-day scientific research, we report herein the synthesis of a class of trisaminocyclopropenium fluorophores along with a systematic investigation of their unique molecular and electronic dependent photophysical properties. Among these fluorophores, tris[N(naphthalen-2-ylmethyl)phenylamino] cyclopropenium chloride (TNTPC) displayed a strong photophysical profile including a 0.92 quantum yield ascribed to intramolecular charge transfer and intramolecular through-space conjugation. Moreover, this cyclopropenium-based fluorophore functions as a competent imaging agent for DNA visualization and nuclear counterstaining in cell culture. To facilitate the broader use of these compounds, design principles supported by density functional theory calculations for engineering analogs of this class of fluorophores are offered. Collectively, this study adds to the burgeoning interest in cyclopropenium compounds and their unique properties as fluorophores with uses in bioimaging applications.
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Affiliation(s)
- Matt Guest
- Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario L2S 3A1, Canada
| | - Roya Mir
- Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario L2S 3A1, Canada
| | - Gregory Foran
- Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario L2S 3A1, Canada
| | - Brianne Hickson
- Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario L2S 3A1, Canada
| | - Aleksandar Necakov
- Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario L2S 3A1, Canada
| | - Travis Dudding
- Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario L2S 3A1, Canada
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5
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Saadat K, Shiri A, Kovačević B. Step Forward to Stronger Neutral Organic Superbases: Fused Troponimines. J Org Chem 2020; 85:11375-11381. [DOI: 10.1021/acs.joc.0c01466] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kayvan Saadat
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, 91775-1436 Mashhad, Iran
| | - Ali Shiri
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, 91775-1436 Mashhad, Iran
| | - Borislav Kovačević
- Group for Computational Life Science, Division of Chemistry, Ruder Boskovic Institute, Bijenicka 54, 10000 Zagreb, Croatia
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6
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Ullrich S, Barić D, Xie X, Kovačević B, Sundermeyer J. Basicity Enhancement by Multiple Intramolecular Hydrogen Bonding in Organic Superbase N,N′,N″,N‴-Tetrakis(3-(dimethylamino)propyl)triaminophosphazene. Org Lett 2019; 21:9142-9146. [DOI: 10.1021/acs.orglett.9b03521] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sebastian Ullrich
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032 Marburg, Germany
| | - Danijela Barić
- The Group for Computational Life Sciences, Ruđer Bošković Institute, Bijenička c. 54, HR-10000 Zagreb, Croatia
| | - Xiulan Xie
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032 Marburg, Germany
| | - Borislav Kovačević
- The Group for Computational Life Sciences, Ruđer Bošković Institute, Bijenička c. 54, HR-10000 Zagreb, Croatia
| | - Jörg Sundermeyer
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032 Marburg, Germany
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7
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Bouchoux G, Eckert-Maksic M. Gas phase basicities of polyfunctional molecules. Part 5: Non-aromatic sp 2 nitrogen containing compounds. MASS SPECTROMETRY REVIEWS 2018; 37:139-170. [PMID: 27275644 DOI: 10.1002/mas.21511] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 05/22/2016] [Indexed: 06/06/2023]
Abstract
This paper constitutes the fifth part of a general review of the gas-phase protonation thermochemistry of polyfunctional molecules (Part 1: Theory and methods, Mass Spectrom Rev 2007, 26:775-835, Part 2: Saturated basic sites, Mass Spectrom Rev 2012, 31:353-390, Part 3: Amino acids, Mass Spectrom Rev 2012, 31:391-435, Part 4: Carbonyl as basic site, Mass Spectrom Rev 2015, 34:493-534). This part is devoted to non-aromatic molecules characterized by a lone pair located on a sp2 nitrogen atom, it embraces functional groups such as imines, amidines, guanidines, diazenes, hydrazines, oximes, and phosphazenes. Specific examples are examined under five major chapters. In the first one, aliphatic and unsaturated (conjugated and cyclic) imines, hydrazones, and oximes are considered. A second chapter describes the protonation energetic of aliphatic, conjugated, or cyclic amidines. Guanidines, polyguanides, and biomolecules containing guanidine were examined in the third chapter. A fourth chapter describes the particular case of the phosphazene molecules. Finally, diazenes and azides were considered in the last chapter. Experimental data were re-evaluated according to the presently adopted basicity scale, i.e., PA(NH3 ) = 853.6 kJ/mol, GB (NH3 ) = 819 kJ/mol. Structural and energetic information given by G4MP2 quantum chemistry computations on typical systems are presented. © 2016 Wiley Periodicals, Inc. Mass Spec Rev 37:139-170, 2018.
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Affiliation(s)
- Guy Bouchoux
- Département de Chimie, Laboratoire de Chimie Moléculaire, UMR CNRS 9168, Ecole Polytechnique, Palaiseau, 91120, France
- Université Paris-Sud XI, ICMO, Orsay, 91405, France
| | - Mirjana Eckert-Maksic
- Division of Organic Chemistry and Biochemistry, Ruder Boskovic Institute, Bijenicka 54, Zagreb, HR 1000, Croatia
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8
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Saadat K, Shiri A, Kovačević B. Substituted troponimines: when aromatization of the conjugate acid leads to very strong neutral organic superbases. NEW J CHEM 2018. [DOI: 10.1039/c8nj02349b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly basic 3,6-disubstituted troponimino-scaffolds enable the introduction of new aromatic-stabilizing neutral organic superbase groups.
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Affiliation(s)
- Kayvan Saadat
- Department of Chemistry
- Faculty of Science
- Ferdowsi University of Mashhad
- Mashhad
- Iran
| | - Ali Shiri
- Department of Chemistry
- Faculty of Science
- Ferdowsi University of Mashhad
- Mashhad
- Iran
| | - Borislav Kovačević
- Group for Computational Life Sciences
- Division of Physical Chemistry
- Ruder Boskovic Institute
- 10000 Zagreb
- Croatia
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9
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Lyons DJM, Crocker RD, Blümel M, Nguyen TV. Promotion of Organic Reactions by Non‐Benzenoid Carbocyclic Aromatic Ions. Angew Chem Int Ed Engl 2016; 56:1466-1484. [DOI: 10.1002/anie.201605979] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Indexed: 12/12/2022]
Affiliation(s)
| | - Reece D. Crocker
- School of Chemistry University of New South Wales Sydney Australia
| | - Marcus Blümel
- School of Chemistry University of New South Wales Sydney Australia
- Institute of Organic Chemistry RWTH Aachen University Landoltweg 1 52074 Aachen Germany
| | - Thanh V. Nguyen
- School of Chemistry University of New South Wales Sydney Australia
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10
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Lyons DJM, Crocker RD, Blümel M, Nguyen TV. Vermittlung organischer Reaktionen durch nichtbenzoide carbocyclische aromatische Ionen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605979] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Reece D. Crocker
- School of Chemistry University of New South Wales Sydney Australien
| | - Marcus Blümel
- School of Chemistry University of New South Wales Sydney Australien
- Institut für Organische Chemie RWTH Aachen Landoltweg 1 52074 Aachen Deutschland
| | - Thanh V. Nguyen
- School of Chemistry University of New South Wales Sydney Australien
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11
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Raczyńska ED, Gal JF, Maria PC. Enhanced Basicity of Push-Pull Nitrogen Bases in the Gas Phase. Chem Rev 2016; 116:13454-13511. [PMID: 27739663 DOI: 10.1021/acs.chemrev.6b00224] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nitrogen bases containing one or more pushing amino-group(s) directly linked to a pulling cyano, imino, or phosphoimino group, as well as those in which the pushing and pulling moieties are separated by a conjugated spacer (C═X)n, where X is CH or N, display an exceptionally strong basicity. The n-π conjugation between the pushing and pulling groups in such systems lowers the basicity of the pushing amino-group(s) and increases the basicity of the pulling cyano, imino, or phosphoimino group. In the gas phase, most of the so-called push-pull nitrogen bases exhibit a very high basicity. This paper presents an analysis of the exceptional gas-phase basicity, mostly in terms of experimental data, in relation with structure and conjugation of various subfamilies of push-pull nitrogen bases: nitriles, azoles, azines, amidines, guanidines, vinamidines, biguanides, and phosphazenes. The strong basicity of biomolecules containing a push-pull nitrogen substructure, such as bioamines, amino acids, and peptides containing push-pull side chains, nucleobases, and their nucleosides and nucleotides, is also analyzed. Progress and perspectives of experimental determinations of GBs and PAs of highly basic compounds, termed as "superbases", are presented and benchmarked on the basis of theoretical calculations on existing or hypothetical molecules.
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Affiliation(s)
- Ewa D Raczyńska
- Department of Chemistry, Warsaw University of Life Sciences (SGGW) , ul. Nowoursynowska 159c, 02-776 Warszawa, Poland
| | - Jean-François Gal
- Institut de Chimie de Nice (ICN) - UMR CNRS 7272, University Nice Sophia Antipolis , Parc Valrose, 06108 Nice Cedex 2, France
| | - Pierre-Charles Maria
- Institut de Chimie de Nice (ICN) - UMR CNRS 7272, University Nice Sophia Antipolis , Parc Valrose, 06108 Nice Cedex 2, France
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12
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Pozharskii AF, Ozeryanskii VA, Mikshiev VY, Antonov AS, Chernyshev AV, Metelitsa AV, Borodkin GS, Fedik NS, Dyablo OV. 10-Dimethylamino Derivatives of Benzo[h]quinoline and Benzo[h]quinazolines: Fluorescent Proton Sponge Analogues with Opposed peri-NMe2/–N═ Groups. How to Distinguish between Proton Sponges and Pseudo-Proton Sponges. J Org Chem 2016; 81:5574-87. [DOI: 10.1021/acs.joc.6b00917] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alexander F. Pozharskii
- Department
of Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Valery A. Ozeryanskii
- Department
of Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Vladimir Y. Mikshiev
- Department
of Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Alexander S. Antonov
- Department
of Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Anatoly V. Chernyshev
- Institute
of Physical and Organic Chemistry, Southern Federal University, Stachki
Ave. 194/2, 344090 Rostov-on-Don, Russian Federation
| | - Anatoly V. Metelitsa
- Institute
of Physical and Organic Chemistry, Southern Federal University, Stachki
Ave. 194/2, 344090 Rostov-on-Don, Russian Federation
| | - Gennady S. Borodkin
- Institute
of Physical and Organic Chemistry, Southern Federal University, Stachki
Ave. 194/2, 344090 Rostov-on-Don, Russian Federation
| | - Nikita S. Fedik
- Department
of Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Olga V. Dyablo
- Department
of Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
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13
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Barić D, Kovačević B. Cyclopropenimine as pincer ligand and strong electron donor in proton sponges. J PHYS ORG CHEM 2016. [DOI: 10.1002/poc.3579] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Danijela Barić
- Group for Computational Life Sciences; Division of Physical Chemistry, Ruđer Bošković Institute; Bijenička 54 10000 Zagreb Croatia
| | - Borislav Kovačević
- Group for Computational Life Sciences; Division of Physical Chemistry, Ruđer Bošković Institute; Bijenička 54 10000 Zagreb Croatia
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14
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Kaljurand I, Saame J, Rodima T, Koppel I, Koppel IA, Kögel JF, Sundermeyer J, Köhn U, Coles MP, Leito I. Experimental Basicities of Phosphazene, Guanidinophosphazene, and Proton Sponge Superbases in the Gas Phase and Solution. J Phys Chem A 2016; 120:2591-604. [DOI: 10.1021/acs.jpca.6b01552] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ivari Kaljurand
- Institute
of Chemistry, University of Tartu, Ravila 14a Str, 50411 Tartu, Estonia
| | - Jaan Saame
- Institute
of Chemistry, University of Tartu, Ravila 14a Str, 50411 Tartu, Estonia
| | - Toomas Rodima
- Institute
of Chemistry, University of Tartu, Ravila 14a Str, 50411 Tartu, Estonia
| | - Ivar Koppel
- Institute
of Computer Sciences, University of Tartu, J. Liivi 2 Str, 50409 Tartu, Estonia
| | - Ilmar A. Koppel
- Institute
of Chemistry, University of Tartu, Ravila 14a Str, 50411 Tartu, Estonia
| | - Julius F. Kögel
- Fachbereich
Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032 Marburg, Germany
| | - Jörg Sundermeyer
- Fachbereich
Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032 Marburg, Germany
| | - Uwe Köhn
- Institut
für Organische Chemie und Makromolekulare Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 10, 07743 Jena, Germany
| | - Martyn P. Coles
- School
of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand
| | - Ivo Leito
- Institute
of Chemistry, University of Tartu, Ravila 14a Str, 50411 Tartu, Estonia
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15
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Belding L, Stoyanov P, Dudding T. Synthesis, Theoretical Analysis, and Experimental pKa Determination of a Fluorescent, Nonsymmetric, In–Out Proton Sponge. J Org Chem 2015; 81:6-13. [DOI: 10.1021/acs.joc.5b01743] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lee Belding
- Brock University, 500 Glenridge
Avenue, St. Catharines, ON L2S 3A1, Canada
| | - Peter Stoyanov
- Brock University, 500 Glenridge
Avenue, St. Catharines, ON L2S 3A1, Canada
| | - Travis Dudding
- Brock University, 500 Glenridge
Avenue, St. Catharines, ON L2S 3A1, Canada
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