Results 71 to 80 of about 10,545 (194)
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 +4 more
doaj
, 2014 Citation: '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.H02732 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
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Application of the Hammett Equation to Substituted Pyridines
Nippon kagaku zassi, 1967 5-置換ニコチン酸エチルの85%エタノール中のアルカリ性加水分解速度に対しては, Hammettのメタ置換基定数を用いるとよくHammett式が成立し, その反応定数ρHは反応温度25℃のとき2. 26であって, 同条件下の置換安息香酸エチルエステルの反応定数ρBとの比は,ρH/ρB=0. 89であった。 また, 5-置換ニコチン酸の50%エタノール水中におけるρKaについてもよくHammett式が成立し, その反応定数は1. 73で, 同条件下の置換安息香酸のρBに対して, ρH/ρB=1. 08であった。すなわち, 置換基,反応基およびヘテロ原子の三者の問に交叉共役が存在しない場合はρH/ρBが1に近くなる。
Yoshio UENO, Eiji IMOTO
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ChemPhysChem, Volume 27, Issue 8, 28 April 2026.For directly comparing experimental results on gas‐phase ion reactions with the predictions from quantum chemical calculations, the latter must first be converted into rate constants. This review addresses the question of whether current methods of statistical rate theory can accomplish this task reliably. Statistical rate theory has long been used for
Thomas Auth, Konrad Koszinowski
wiley +1 more source
, 2014 We study Landau damping in the 1+1D Vlasov-Poisson system using a Fourier-Hermite spectral representation. We describe the propagation of free energy in phase space using forwards and backwards propagating Hermite modes recently developed for ...
Dellar, P. J., Parker, J. T.
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, 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.
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European Journal of Organic Chemistry, Volume 29, Issue 13, 13 April 2026.Fluoro substituents on a benzene ring linked to a 2‐bromoaryl group enables the selective activation of one of its C─H bonds via Pd‐1,4‐migration. Then, Pd‐catalyzed direct coupling with heteroarenes produces C2’‐heteroarylated 1,1′‐biaryls. In this reaction, the new C–C bond arises from the functionalization of two C─H bonds.
Norman Le Floch +2 more
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Stage‐Specific Roles of Deep Eutectic Solvents in Recycling of Spent Lithium‐Ion Batteries
Advanced Energy Materials, Volume 16, Issue 13, 1 April 2026.Deep eutectic solvents (DESs) offer tunable acidity, redox, and coordination properties for selective recycling of spent lithium‐ion battery cathodes. Through co‐dissolution, single‐ and two‐metal separations, DESs enable sustainable recovery of critical metals for closed‐loop regeneration of battery‐grade materials, advancing a circular economy for ...
Jingxiu Wang +4 more
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On comparability of bigrassmannian permutations [PDF]
, 2018 Let Sn and Gn denote the respective sets of ordinary and bigrassmannian (BG) permutations of order n, and let (Gn,≤) denote the Bruhat ordering permutation poset.
Engbers, John, Hammett, Adam
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Fluctuation-dissipation relations for a plasma-kinetic Langevin equation
, 2014 A linearised kinetic equation describing electrostatic perturbations of a Maxwellian equilibrium in a weakly collisional plasma forced by a random source is considered.
Dorland, W. +3 more
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