Results 41 to 50 of about 1,354 (166)

Determination of acid dissociation constants of some hydroxy schiff bases by pH-metric titration. application of the Hammett equation

MATEC Web of Conferences, 2013
Ten compounds hydroxybases Schiff were synthesized from salicylaldehyde and the substituted aniline in the ortho, meta and para methyl groups, chloro and nitro.
Hadjeb R., Bara A., Barkat D.
doaj   +1 more source

The reactivity of propyl esters of 2-(benzoylamino)(1-R-2-oxoindoline-3-ylidene) acetic acids

Журнал органічної та фармацевтичної хімії, 2019
Aim. To study the reactivity of esters of 2-(benzoylamino)(1-R-2-oxoindoline-3-ylidene) acetic acids. Results and discussion. The reaction rate constants of alkaline hydrolysis of esters of 2-(benzoylamino) (1-R-2-oxoindoline-3-ylidene) acetic acids ...
O. M. Svechnikova, S. V. Kolisnyk, O. F. Vynnyk, O. O. Altukhov, T. A. Kostina   +4 more
doaj   +1 more source

Catalytic Sulfur‐Atom Transfer Enabled by a Bis(disulfide) Titanium Complex

Angewandte Chemie International Edition, EarlyView.
Multi‐electron transformations with titanium are underexplored due to limited access to low‐valent precursors. The four‐electron activation of elemental sulfur by a Ti(IV) complex yields a rare titanium bis(disulfide) complex, enabling the efficient catalytic synthesis of isothiocyanates from isonitriles under mild conditions.
Sebastian Samir Cremer, Peter Coburger, Corinna Czernetzki, Gabriele Hierlmeier   +3 more
wiley   +1 more source

Linear free energy relationships in theoretical NMR ¹³С spectra of sin-[(1-R-η³ -C₃H₄)Pd(Me₂C=O)₂]⁺ complexes

Тонкие химические технологии, 2010
Both theoretical values of NMR 13С chemical shifts and frontier orbital energies (DFT method) for syn-[(1-R-η3-C3H4)Pd(Me2C=O)2]+ follow one- and two-parameter linear regressions which involve σ+ and σ- constants, as well as Swain-Lupton parameters R+, R-
M. H. Elhussien, E. M. Evstigneeva, V. R. Flid   +2 more
doaj  

CORRELATION ANALYSIS OF IR, 1 H- AND 13 C-NMR SPECTRAL DATA OF N-ALKYL AND N-CYCLOALKYL CYANOACETAMIDES [PDF]

Chemical Industry and Chemical Engineering Quarterly, 2011
Linear free energy relationships (LFER) were applied to the IR, 1H- and 13C--NMR spectral data in N-alkyl and N-cycloalkyl cyanoacetamides. N-alkyl and N-cycloalkyl cyanocetamides were synthesized from corresponding amine and ethyl cyanoacetate. A number
Aleksandar D. Marinković, Jelena Nedeljković, Dušan Ž. Mijin, Nataša Ilić, Slobodan D. Petrović   +4 more
doaj  

extended Hammett equation

, 2014
Citation: 'extended Hammett equation' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.E02279 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
openaire   +1 more source

Applicability of Hammett Equation in the Iodination of Acetophenones

, 1970
The rate constants for the iodination of acetophenones have been measured colorimetrically in 1·388(M) aqueous perchloric acid. The value of p, the reaction constant and the resonaρnce interaction energy for the para substituents have also been calculated.
Mishra, Suniti, P. L. Nayak, M. K. Rout
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Electronic Contributions to the σ_p Parameter of the Hammett Equation

The Journal of Organic Chemistry, 2003
A statistical procedure to obtain the intrinsic electronic contributions to the Hammett substituent constant sigma(p) is reported. The method is based on the comparison between the experimental sigma(p) values and the electronic electrophilicity index omega evaluated for a series of 42 functional groups commonly present in organic compounds.
Domingo, LR, Perez, P, Contreras, R
openaire   +6 more sources

Photolytic Hydrophosphination: Insights Into Catalyzed and Uncatalyzed Processes

Chemistry – A European Journal, EarlyView.
Catalyst‐free photolytic hydrophosphination is demonstrated for vinyl arenes and activated alkenes in polar protic (alcohol) solvents. These reactions appear to be closed‐shell, affirming that even ambient light can impact a reaction—a potentially broad influence on even mundane reactions.
Emma J. Finfer, Evelyn M. Kempf, Rory Waterman   +2 more
wiley   +1 more source

Sonochemical Synthesis of Cobalt‐Oxo‐Cubanes as Redox‐Active Platform for Proton‐Coupled Electron Transfer

Chemistry – A European Journal, EarlyView.
A facile sonochemical method for rapid and gram‐scale synthesis of ligand‐tunable cobalt‐oxo‐cubanes is reported. Electrochemical studies reveal a Co4O4‐centered one‐electron oxidation and PCET pathway, while identifying Co2+ impurities as key disruptors of true cubane redox chemistry.
Satyapriya Nath, Amjath Nihal Thiruthimmal, Tapan Ping, Sankalpa N. Panda, Loknath Patro, Jeebanjyoti Mohapatra, B. L. Bhargava, Bikash Kumar Jena, Bishnu P. Biswal   +8 more
wiley   +1 more source