Results 1 to 10 of about 290,507 (301)

Influence of Steric Effect on the Pseudo-Multicomponent Synthesis of N-Aroylmethyl-4-Arylimidazoles [PDF]

open access: yesMolecules, 2022
A pseudo-three-component synthesis of N-aroylmethylimidazoles 3 with three new C–N bonds formed regioselectively under microwave conditions was developed.
Nerith Rocio Elejalde-Cadena   +5 more
doaj   +2 more sources

The Steric Effect in Preparations of Vanadium(II)/(III) Dinitrogen Complexes of Triamidoamine Ligands Bearing Bulky Substituents [PDF]

open access: yesMolecules, 2022
The reactions of newly designed lithiated triamidoamines Li3LR (R = iPr, Pen, and Cy2) with VCl3(THF)3 under N2 yielded dinitrogen–divanadium complexes with a μ-N2 between vanadium atoms [{V(LR)}2(μ-N2)] (R = iPr (1) and Pen (2)) for the former two ...
Yoshiaki Kokubo   +7 more
doaj   +2 more sources

Steric Effect of Antioxidant Diels-Alder-Type Adducts: A Comparison of Sanggenon C with Sanggenon D [PDF]

open access: yesMolecules, 2018
Sanggenons C and D are two Diels-Alder-type adducts from Chinese crude drug Sang-bai-pi. Structurally, both sanggenons construct stereoisomers. In the study, they were comparatively determined using four antioxidant assays, including ferric ion reducing ...
Xican Li   +7 more
doaj   +2 more sources

STERIC EFFECT IN DIFLUORINEALCANE MOLECULES [PDF]

open access: yesФизико-химические аспекты изучения кластеров, наноструктур и наноматериалов, 2019
Fifteen conformers of the CHF2 – (CH2)6 – CH3 molecule were found. Within a «quantum theory of atoms in molecules», their equilibrium geometry, total energies and the electron structure were studied.
A.V. Kotomkin   +3 more
doaj   +2 more sources

Dual Effect of Steric Hindrance in Non‐Aqueous Amine Absorbents: Navigating the Trade‐Off Between Kinetics and Thermodynamics for Efficient CO2 Capture [PDF]

open access: yesAdvanced Science
Sterically hindered amines (SHAs) offering high theoretical capacity and reduced regeneration energy, yet their molecular mechanism, especially in non‐aqueous solvents, remains unclear.
Xiaoyi Gao   +8 more
doaj   +2 more sources

Steric and Slippage Effects on Mass Transport by Using an Oscillatory Electroosmotic Flow of Power-Law Fluids

open access: yesMicromachines, 2021
In this paper, the combined effect of the fluid rheology, finite-sized ions, and slippage toward augmenting a non-reacting solute’s mass transport due to an oscillatory electroosmotic flow (OEOF) is determined.
Ruben Baños   +3 more
doaj   +1 more source

Review and Modification of Entropy Modeling for Steric Effects in the Poisson-Boltzmann Equation

open access: yesEntropy, 2020
The classical Poisson-Boltzmann model can only work when ion concentrations are very dilute, which often does not match the experimental conditions.
Tzyy-Leng Horng
doaj   +1 more source

Redox Potential and Crystal Chemistry of Hexanuclear Cluster Compounds

open access: yesMolecules, 2021
Most of TM6-cluster compounds (TM = transition metal) are soluble in polar solvents, in which the cluster units commonly remain intact, preserving the same atomic arrangement as in solids.
Elena Levi, Doron Aurbach, Carlo Gatti
doaj   +1 more source

Ferrocenoyl-adenines: substituent effects on regioselective acylation

open access: yesBeilstein Journal of Organic Chemistry, 2022
A series of N6-substituted adenine–ferrocene conjugates was prepared and the reaction mechanism underlying the synthesis was explored. The SN2-like reaction between ferrocenoyl chloride and adenine anions is a regioselective process in which the product ...
Mateja Toma   +5 more
doaj   +1 more source

Metal–Metal Bond in the Light of Pauling’s Rules

open access: yesMolecules, 2021
About 70 years ago, in the framework of his theory of chemical bonding, Pauling proposed an empirical correlation between the bond valences (or effective bond orders (BOs)) and the bond lengths.
Elena Levi, Doron Aurbach, Carlo Gatti
doaj   +1 more source

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