Results 91 to 100 of about 10,545 (194)

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
openaire   +1 more source

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

Landau Damping in a Turbulent Setting

, 2012
To address the problem of Landau damping in kinetic turbulence, the forcing of the linearized Vlasov equation by a stationary random source is considered.
Frisch U., G. G. Plunk, Landau L., Landau L., Swanson D., Trefethen L. N., Van Kampen N. G.   +6 more
core   +1 more source

Understanding nonlinear saturation in zonal-flow-dominated ion temperature gradient turbulence

, 2015
We propose a quantitative model of ion temperature gradient driven turbulence in toroidal magnetized plasmas. In this model, the turbulence is regulated by zonal flows, i.e. mode saturation occurs by a zonal-flow-mediated energy cascade ("shearing"), and
Jenko, F., Navarro, A. Bañón, Plunk, G. G.   +2 more
core   +1 more source

A New Numerical Scheme for Cosmic Ray Transport

, 2017
Numerical solutions of the cosmic-ray (CR) magneto-hydrodynamic equations are dogged by a powerful numerical instability, which arises from the constraint that CRs can only stream down their gradient.
Jiang, Yan-Fei, Oh, Peng
core   +1 more source

Molecular control over vitrimer-like mechanics - tuneable dynamic motifs based on the Hammett equation in polyimine materials. [PDF]

Chem Sci, 2020
Schoustra SK, Dijksman JA, Zuilhof H, Smulders MMJ.   +3 more
europepmc   +1 more source

A multi-faceted study combining quantum chemical, Hammett parameters, and antibacterial assessment for imidazole: based green ionic liquids corrosion inhibition. [PDF]

BMC Chem
Moustafa AHE, Abdel-Rahman HH, Hagar M, Bishr SAA.   +3 more
europepmc   +1 more source

C-N Coupling of 3-Aminothiophene with Substituted Benzenediazonium Cations: Carbon Nucleophilicity, Hyper-Ortho Effects, and Predictive Modeling of Structural Analogs. [PDF]

Chemphyschem
El Abed R, Slama T, Mahdhaoui F, Boubaker T.   +3 more
europepmc   +1 more source

About a Trillion Times More Acidic than Expected? On the Difference Between the Hammett H₀ and the Unified pH Acidity of Sulfuric Acid. [PDF]

Angew Chem Int Ed Engl
Radtke V, Bäuerle M, Stroh R, Kienzle T, Himmel D, Heering A, Nerut J, Lust E, Leito I, Krossing I.   +9 more
europepmc   +1 more source

The Nonadiabatic Nature of the Substituent Effects in Azobenzene. [PDF]

Angew Chem Int Ed Engl
van der Wal JJ, Peshkov RY, Steen JD, Simeth NA, Crespi S.   +4 more
europepmc   +1 more source