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Articles (49)
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Emptying of Large-Scale Pipeline by Pressurized Air

Laanearu, Janek, Annus, Ivar, Koppel, Tiit, Bergant, Anton, Vučković, Sašo, Hou, Qingzhi, Tijsseling, Arris S., Anderson, Alexander, van’t Westende, Jos M. C.

Journal:

Journal of Hydraulic Engineering

Année:

2012

Langue:

english

Fichier:

PDF, 1.24 MB

english, 2012

Development of Accelerating Pipe Flow Starting From Rest

Annus, Ivar, Koppel, Tiit, Sarv, Laur, Ainola, Leo

Journal:

Journal of Fluids Engineering

Année:

2013

Langue:

english

Fichier:

PDF, 827 KB

english, 2013

Superacidity of neutral Brönsted acids in gas phase

Peeter Burk, Ilmar A. Koppel, Ivar Koppel, Lev M. Yagupolskii, Robert W. Taft

Journal:

Journal of Computational Chemistry

Année:

1996

Langue:

english

Fichier:

PDF, 816 KB

english, 1996

Revision of the Gas-Phase Acidity Scale below 300 kcal mol −1

Leito, Ivo, Raamat, Elin, Kütt, Agnes, Saame, Jaan, Kipper, Karin, Koppel, Ilmar A., Koppel, Ivar, Zhang, Min, Mishima, Masaaki, Yagupolskii, Lev M., Garlyauskayte, Romute Yu., Filatov, Andrey A.

Journal:

Journal of Physical Chemistry A

Année:

2009

Langue:

english

Fichier:

PDF, 182 KB

english, 2009

Experimental Investigation on Rapid Filling of a Large-Scale Pipeline

Hou, Qingzhi, Tijsseling, Arris S., Laanearu, Janek, Annus, Ivar, Koppel, Tiit, Bergant, Anton, Vučković, Sašo, Anderson, Alexander, van ’t Westende, Jos M. C.

Journal:

Journal of Hydraulic Engineering

Année:

2014

Langue:

english

Fichier:

PDF, 6.78 MB

english, 2014

The enormous acidifying effect of the supersubstituent NSO2CF3 on the acidity of derivatives of benzenesulfonamide and toluene-p-sulfonamide in the gas phase and in dimethyl sulfoxide

Koppel, Ilmar A., Koppel, Juta, Leito, Ivo, Koppel, Ivar, Mishima, Masaaki, Yagupolskii, Lev M.

Journal:

Journal of the Chemical Society Perkin Transactions 2

Année:

2001

Langue:

english

Fichier:

PDF, 115 KB

english, 2001

Basicity Limits of Neutral Organic Superbases

Leito, Ivo, Koppel, Ilmar A., Koppel, Ivar, Kaupmees, Karl, Tshepelevitsh, Sofja, Saame, Jaan

Journal:

Angewandte Chemie International Edition

Année:

2015

Langue:

english

Fichier:

PDF, 1.27 MB

english, 2015

Solute-solvent and solvent-solvent interactions in binary solvent mixtures. 2. Effect of temperature on the ET(30) polarity parameter of dipolar hydrogen bond acceptor-hydrogen bond donor mixtures

Elisabeth Bosch, Martí Rosés, Koit Herodes, Ilmar Koppel, Ivo Leito, Ivar Koppel, Veiko Taal

Journal:

Journal of Physical Organic Chemistry

Année:

1996

Langue:

english

Fichier:

PDF, 560 KB

english, 1996

Stereoelectronic, Strain, and Medium Effects on the Protonation of Cubylamine, a Janus-like Base

José-Luis M. Abboud, Ilmar A. Koppel, Ibon Alkorta, Ernest W. Della, Paul Müller, Juan Z. Dávalos, Peeter Burk, Ivar Koppel, Viljar Pihl, Esther Quintanilla

Journal:

Angewandte Chemie

Année:

2003

Langue:

english

Fichier:

PDF, 117 KB

english, 2003

Protonation of Cubane in the Gas Phase: A High-Level Ab Initio and DFT Study

José-Luis M. Abboud, Ilmar A. Koppel, Juan Z. Dávalos, Peeter Burk, Ivar Koppel, Esther Quintanilla

Journal:

Angewandte Chemie

Année:

2003

Langue:

english

Fichier:

PDF, 92 KB

english, 2003

Stereoelectronic, Strain, and Medium Effects on the Protonation of Cubylamine, a Janus-like Base

José-Luis M. Abboud, Ilmar A. Koppel, Ibon Alkorta, Ernest W. Della, Paul Müller, Juan Z. Dávalos, Peeter Burk, Ivar Koppel, Viljar Pihl, Esther Quintanilla

Journal:

Angewandte Chemie International Edition

Année:

2003

Langue:

english

Fichier:

PDF, 118 KB

english, 2003

Protonation of Cubane in the Gas Phase: A High-Level Ab Initio and DFT Study

José-Luis M. Abboud, Ilmar A. Koppel, Juan Z. Dávalos, Peeter Burk, Ivar Koppel, Esther Quintanilla

Journal:

Angewandte Chemie International Edition

Année:

2003

Langue:

english

Fichier:

PDF, 92 KB

english, 2003

Brønsted Basicities of Diamines in the Gas Phase, Acetonitrile, and Tetrahydrofuran

Eva-Ingrid Rõõm, Agnes Kütt, Ivari Kaljurand, Ivar Koppel, Ivo Leito, Ilmar A. Koppel, Masaaki Mishima, Kenta Goto, Yuji Miyahara

Journal:

Chemistry - A European Journal

Année:

2007

Langue:

english

Fichier:

PDF, 357 KB

english, 2007

Boratabenzene Anions C5B(CN)6− and C5B(CF3)6− and the Superacidic Properties of their Conjugate Acids

Agnes Kütt, Ivar Koppel, Ilmar A. Koppel, Ivo Leito

Journal:

ChemPhysChem

Année:

2009

Langue:

english

Fichier:

PDF, 174 KB

english, 2009

Basicity of Guanidines with Heteroalkyl Side Chains in Acetonitrile

Mirjana Eckert-Maksić, Zoran Glasovac, Pavle Trošelj, Agnes Kütt, Toomas Rodima, Ivar Koppel, Ilmar A. Koppel

Journal:

European Journal of Organic Chemistry

Année:

2008

Langue:

english

Fichier:

PDF, 330 KB

english, 2008

The enormous apparent gas-phase acidity of cubylamine

José-Luis M. Abboud, Ibon Alkorta, Peeter Burk, Juan Z. Dávalos, Esther Quintanilla, Ernest W. Della, Ilmar A. Koppel, Ivar Koppel

Journal:

Chemical Physics Letters

Année:

2004

Langue:

english

Fichier:

PDF, 273 KB

english, 2004

Critical test of performance of B3LYP functional for prediction of gas-phase acidities and basicities

Peeter Burk, Ilmar A. Koppel, Ivar Koppel, Ivo Leito, Oksana Travnikova

Journal:

Chemical Physics Letters

Année:

2000

Langue:

english

Fichier:

PDF, 79 KB

english, 2000

Influence of substituents on the infrared stretching frequencies of carbonyl group in esters of benzoic acid

Vilve Nummert, Oksana Travnikova, Signe Vahur, Ivo Leito, Mare Piirsalu, Vahur Mäemets, Ivar Koppel, Ilmar A. Koppel

Journal:

Journal of Physical Organic Chemistry

Année:

2006

Langue:

english

Fichier:

PDF, 187 KB

english, 2006

Feasibility of the spontaneous gas-phase proton transfer equilibria between neutral Brønsted acids and Brønsted bases

Peeter Burk, Ivar Koppel, Aleksander Trummal, Ilmar A. Koppel

Journal:

Journal of Physical Organic Chemistry

Année:

2008

Langue:

english

Fichier:

PDF, 147 KB

english, 2008

Quantitative description of acidity of XOH compounds in the gas phase and dimethyl sulphoxide with use of HOMO energies of XO− anions

Vladislav M. Vlasov, Ilmar A. Koppel, Peeter Burk, Ivar Koppel

Journal:

Journal of Physical Organic Chemistry

Année:

1995

Langue:

english

Fichier:

PDF, 448 KB

english, 1995

Critical test of PM3-calculated proton affinities

Peeter Burk, Koit Herodes, Ivar Koppel, Ilmar Koppel

Journal:

International Journal of Quantum Chemistry

Année:

1993

Langue:

english

Fichier:

PDF, 393 KB

english, 1993

A New Class of Organosuperbases, N-Alkyl- and N-Aryl-1,3-dialkyl-4,5-dimethylimidazol-2-ylidene Amines: Synthesis, Structure, pKBH+ Measurements, and Properties

Roman A. Kunetskiy, Dr. Svetlana M. Polyakova, Jiří Vavřík, Dr. Ivana Císařová, Jaan Saame, Eva Roos Nerut, Dr. Ivar Koppel, Prof. Ilmar A. Koppel, Dr. Agnes Kütt, Prof. Ivo Leito, Dr. Ilya M. Lyapkal

Journal:

Chemistry - A European Journal

Année:

2012

Langue:

english

Fichier:

PDF, 470 KB

english, 2012

The basicity of substituted N,N-dimethylanilines in solution and in the gas phase

Ivari Kaljurand, Roman Lilleorg, Algis Murumaa, Masaaki Mishima, Peeter Burk, Ivar Koppel, Ilmar A. Koppel, Ivo Leito

Journal:

Journal of Physical Organic Chemistry

Année:

2012

Langue:

english

Fichier:

PDF, 538 KB

english, 2012

Acidities of strong neutral Brønsted acids in different media

Elin Raamat, Karl Kaupmees, Gea Ovsjannikov, Aleksander Trummal, Agnes Kütt, Jaan Saame, Ivar Koppel, Ivari Kaljurand, Lauri Lipping, Toomas Rodima, Viljar Pihl, Ilmar A. Koppel, Ivo Leito

Journal:

Journal of Physical Organic Chemistry

Année:

2012

Langue:

english

Fichier:

PDF, 532 KB

english, 2012

Revised and Expanded Scale of Gas-Phase Lithium Cation Basicities. An Experimental and Theoretical Study

Burk, Peeter, Koppel, Ilmar A., Koppel, Ivar, Kurg, Riho, Gal, Jean-Francois, Maria, Pierre-Charles, Herreros, Marta, Notario, Rafael, Abboud, Jose-Luis M., Anvia, Frederick, Taft, Robert W.

Journal:

Journal of Physical Chemistry A

Année:

2000

Langue:

english

Fichier:

PDF, 138 KB

english, 2000

Pentakis(trifluoromethyl)phenyl, a Sterically Crowded and Electron-withdrawing Group: Synthesis and Acidity of Pentakis(trifluoromethyl)benzene, -toluene, -phenol, and -aniline

Kütt, Agnes, Movchun, Valeria, Rodima, Toomas, Dansauer, Timo, Rusanov, Eduard B., Leito, Ivo, Kaljurand, Ivari, Koppel, Juta, Pihl, Viljar, Koppel, Ivar, Ovsjannikov, Gea, Toom, Lauri, Mishima, Masaa

Journal:

Journal of Organic Chemistry

Année:

2008

Langue:

english

Fichier:

PDF, 291 KB

english, 2008

[American Society of Civil Engineers 12th Annual Conference on Water Distribution Systems Analysis (WDSA) - Tucson, Arizona, United States (September 12-15, 2010)] Water Distribution Systems Analysis 2010 - Using Transient Flow Equations for Modelling of Filling and Emptying of Large-Scale Pipeline

Koppel, Tiit, Laanearu, Janek, Annus, Ivar, Raidmaa, Meelis

Année:

2011

Langue:

english

Fichier:

PDF, 418 KB

english, 2011

Experimental Gas-Phase Basicity Scale of Superbasic Phosphazenes

Kaljurand, Ivari, Koppel, Ilmar A., Kütt, Agnes, Rõõm, Eva-Ingrid, Rodima, Toomas, Koppel, Ivar, Mishima, Masaaki, Leito, Ivo

Journal:

Journal of Physical Chemistry A

Année:

2007

Langue:

english

Fichier:

PDF, 125 KB

english, 2007

Gas-Phase Acidities of Some Neutral Brønsted Superacids: A DFT and ab Initio Study

Koppel, Ilmar A., Burk, Peeter, Koppel, Ivar, Leito, Ivo, Sonoda, Takaaki, Mishima, Masaaki

Journal:

Journal of the American Chemical Society

Année:

2000

Langue:

english

Fichier:

PDF, 197 KB

english, 2000

Gas-Phase Brønsted Superacidity of Some Derivatives of Monocarba- closo -Borates: a Computational Study

Lipping, Lauri, Leito, Ivo, Koppel, Ivar, Koppel, Ilmar A.

Journal:

Journal of Physical Chemistry A

Année:

2009

Langue:

english

Fichier:

PDF, 294 KB

english, 2009

Intrinsic Basicities of Phosphorus Imines and Ylides: A Theoretical Study

Koppel, Ilmar A., Schwesinger, Reinhard, Breuer, Thomas, Burk, Peeter, Herodes, Koit, Koppel, Ivar, Leito, Ivo, Mishima, Masaaki

Journal:

Journal of Physical Chemistry A

Année:

2001

Langue:

english

Fichier:

PDF, 132 KB

english, 2001

Additivity of substituent effects on the acidity of alcohols

Abboud, José-Luis M., Koppel, Ilmar A., Koppel, Ivar

Journal:

Journal of Physical Organic Chemistry

Année:

2013

Langue:

english

Fichier:

PDF, 422 KB

english, 2013

Generalized Principle of Designing Neutral Superstrong Brønsted Acids

Koppel, Ilmar A., Burk, Peeter, Koppel, Ivar, Leito, Ivo

Journal:

Journal of the American Chemical Society

Année:

2002

Langue:

english

Fichier:

PDF, 97 KB

english, 2002

Acidity of Anilines: Calculations vs Experiment

Lipping, Lauri, Kütt, Agnes, Kaupmees, Karl, Koppel, Ivar, Burk, Peeter, Leito, Ivo, Koppel, Ilmar A.

Journal:

Journal of Physical Chemistry A

Année:

2011

Langue:

english

Fichier:

PDF, 1.08 MB

english, 2011

Guanidinophosphazenes: Design, Synthesis, and Basicity in THF and in the Gas Phase

Kolomeitsev, Alexander A., Koppel, Ilmar A., Rodima, Toomas, Barten, Jan, Lork, Enno, Röschenthaler, Gerd-Volker, Kaljurand, Ivari, Kütt, Agnes, Koppel, Ivar, Mäemets, Vahur, Leito, Ivo

Journal:

Journal of the American Chemical Society

Année:

2005

Langue:

english

Fichier:

PDF, 264 KB

english, 2005

Polytrifluoromethylation versus Polyfluorination of the Isomers of Kekulé Benzene and Phenol: A Theoretical Study

Lipping, Lauri, Koppel, Ivar, Koppel, Ilmar A., Kolomeitsev, Alexander, Röschenthaler, Gerd-Volker, Leito, Ivo

Journal:

Journal of Organic Chemistry

Année:

2010

Langue:

english

Fichier:

PDF, 1.04 MB

english, 2010

Relativistic effects on acidities and basicities of Brønsted acids and bases containing gold

Koppel, Ilmar A., Burk, Peeter, Kasemets, Kalev, Koppel, Ivar

Journal:

Physical Chemistry Chemical Physics

Année:

2013

Langue:

english

Fichier:

PDF, 1.09 MB

english, 2013

Hydrogen-Bonding Interactions of (CF 3 ) 3 CH and (CF 3 ) 3 C − in the Gas Phase. An Experimental (FT-ICR) and Computational Study

Guerrero, Andrés, Herrero, Rebeca, Dávalos, Juan Z., Koppel, Ivar, Abboud, José-Luis M., Chana, Antonio, Koppel, Ilmar A.

Journal:

Journal of Physical Chemistry A

Année:

2009

Langue:

english

Fichier:

PDF, 923 KB

english, 2009

Calculations of p K a of Superacids in 1,2-Dichloroethane

Trummal, Aleksander, Rummel, Alar, Lippmaa, Endel, Koppel, Ivar, Koppel, Ilmar A.

Journal:

Journal of Physical Chemistry A

Année:

2011

Langue:

english

Fichier:

PDF, 757 KB

english, 2011

Acidity of benzoylcarbamates in dimethyl sulfoxide. Confirmation of mixed N/O alkylation in the Mitsunobu reaction

Koppel, Ilmar, Koppel, Juta, Koppel, Ivar, Leito, Ivo, Pihl, Viljar, Wallin, Annelie, Grehn, Leif, Ragnarsson, Ulf

Journal:

Journal of the Chemical Society Perkin Transactions 2

Année:

1993

Langue:

english

Fichier:

PDF, 463 KB

english, 1993

Acute Poisoning With Bromofosmethyl (Bromophos)

Köppel, Claus, Thomsen, Torben, Heinemeyer, Gerhard, Roots, Ivar

Journal:

Clinical Toxicology (Informa Healthcare)

Année:

1991

Langue:

english

Fichier:

PDF, 227 KB

english, 1991

Superacidity of closo -Dodecaborate-Based Brønsted Acids: a DFT Study

Lipping, Lauri, Leito, Ivo, Koppel, Ivar, Krossing, Ingo, Himmel, Daniel, Koppel, Ilmar A.

Journal:

Journal of Physical Chemistry A

Année:

2015

Langue:

english

Fichier:

PDF, 2.42 MB

english, 2015

Development of radial velocity component in accelerating start-up pipe flow

Annus, Ivar, Koppel, Tiit

Journal:

European Journal of Mechanics - B/Fluids

Année:

2015

Langue:

english

Fichier:

PDF, 1.47 MB

english, 2015

Transition to Turbulence in Accelerating Pipe Flow

Annus, Ivar, Koppel, Tiit

Journal:

Journal of Fluids Engineering

Année:

2011

Langue:

english

Fichier:

PDF, 1.38 MB

english, 2011

Experimental Basicities of Phosphazene, Guanidinophosphazene, and Proton Sponge Superbases in the Gas Phase and Solution

Kaljurand, Ivari, Saame, Jaan, Rodima, Toomas, Koppel, Ivar, Koppel, Ilmar A., Kögel, Julius F., Sundermeyer, Jörg, Köhn, Uwe, Coles, Martyn P., Leito, Ivo

Journal:

Journal of Physical Chemistry A

Année:

2016

Langue:

english

Fichier:

PDF, 1.88 MB

english, 2016

Solution and Gas-Phase Acidities of all-trans ( all-E ) Retinoic Acid: An Experimental and Computational Study

Abboud, José-Luis M., Koppel, Ilmar A., Uggerud, Einar, Leito, Ivo, Koppel, Ivar, Sekiguchi, Osamu, Kaupmees, Karl, Saame, Jaan, Kütt, Karl, Mishima, Masaaki

Journal:

Chemistry - A European Journal

Année:

2015

Langue:

english

Fichier:

PDF, 492 KB

english, 2015

Basicity Limits of Neutral Organic Superbases

Leito, Ivo, Koppel, Ilmar A., Koppel, Ivar, Kaupmees, Karl, Tshepelevitsh, Sofja, Saame, Jaan

Journal:

Angewandte Chemie

Année:

2015

Langue:

english

Fichier:

PDF, 1.26 MB

english, 2015

The Thermodynamic Stability of Adamantylideneadamantane and Its Proton- and Electron-Exchanges. Comparison with Simple Alkenes

Abboud, José-Luis M., Alkorta, Ibon, Dávalos, Juan Z., Koppel, Ilmar A., Koppel, Ivar, Lenoir, Dieter, Martínez, Sonia, Mishima, Masaaki

Journal:

Bulletin of the Chemical Society of Japan

Année:

2016

Langue:

english

Fichier:

PDF, 1.77 MB

english, 2016

Divergent Access to Histone Deacetylase Inhibitory Cyclopeptides via a Late-Stage Cyclopropane Ring Cleavage Strategy. Short Synthesis of Chlamydocin

Elek, Gábor Zoltán, Koppel, Kaur, Zubrytski, Dzmitry M., Konrad, Nele, Järving, Ivar, Lopp, Margus, Kananovich, Dzmitry G.

Journal:

Organic Letters

Année:

2019

Langue:

english

Fichier:

PDF, 1011 KB

english, 2019