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Steric Effects of N-Alkyl Group on the Base-Induced Nitrogen to Carbon Rearrangement of Orthogonally Protected N-Alkyl Arylsulphonamides [PDF]

open access: yesMolecules
The rearrangement of a total of 56 members of 22 series of orthogonally protected N-alkyl arylsulphonamides of general structure 4-XC6H4SO2NR1CO2R2 [X = H, CH3, F, Cl, Br, CH3O, CN, CF3 or C(CH3)3; R1 = CH3, CH2CH3, CH2CH2CH3, CH(CH3)2 or CH2CH(CH3)2; R2
Amie Saidykhan   +4 more
doaj   +2 more sources

Steric effects in cyclization reactions [PDF]

open access: bronzeAustralian Journal of Chemistry, 1976
Calculations of geometric probability factors indicate that steric effects are important in determining whether the cyclization of β-substituted diallylmethylammonium ions results in five- or six-memberedrings. Evidence is obtained of the direction of intramolecular attack.
David H. Solomon   +3 more
openaire   +5 more sources

A Highly Efficient Regioselective Addition of Acetylides to Enediones Based on Steric Effects [PDF]

open access: yesMolecules, 2013
A simple and efficient strategy for the synthesis of 1-ethynylcyclohex-2-enol derivatives was developed utilizing regioselective addition of acetylides to enediones based on steric effects.
Zhaohai Qin   +6 more
doaj   +2 more sources

Electrostatic and steric effects underlie acetylation-induced changes in ubiquitin structure and function [PDF]

open access: yesNature Communications, 2022
Ubiquitin is not only a posttranslational modifier but itself is subject to modifications, such as acetylation. Characterization of distinct acetylated ubiquitin variants reveals that each acetylation site has a particular impact on ubiquitin structure ...
Simon Maria Kienle   +9 more
doaj   +2 more sources

A database of steric and electronic properties of heteroaryl substituents [PDF]

open access: yesScientific Data
Heteroaryl substituents are important building blocks of functionalized organic compounds in drug discovery, materials science, and catalysis. Quantitative descriptions of steric and electronic properties of heteroaryl substituents are essential in ...
Turki M. Alturaifi   +3 more
doaj   +2 more sources

Insights on tert-butyl alkylation effects on fluorobenzene

open access: yesScientific African, 2021
Directing effects of substituents on the benzene ring, ortho and para directors by electron donating groups and meta directors using electron withdrawing groups have been studied and reported widely. In particular and for many years, the directing effect
Lewis Mtashobya
doaj   +1 more source

A Computational Chemistry Investigation of the Influence of Steric Bulk of Dithiocarbamato-Bound Organic Substituents upon Spodium Bonding in Three Homoleptic Mercury(II) Bis(N,N-dialkyldithiocarbamato) Compounds for Alkyl = Ethyl, Isobutyl, and Cyclohexyl

open access: yesInorganics, 2023
Three homoleptic Hg(S2CNR2)2, for R = ethyl (1), isobutyl (2), and cyclohexyl (3), compounds apparently exhibit a steric-dependent supramolecular association in their crystals.
Rosa M. Gomila   +2 more
doaj   +1 more source

Steric Effects on Space Electroosmotic Thrusters in Soft Nanochannels

open access: yesMathematics, 2021
The influence of steric effects on the performances of space electroosmotic thrusters (EOTs) was numerically delineated in soft nanochannels for which its walls are covered with polyelectrolyte materials.
Jiaxuan Zheng, Beinan Jia, Yongjun Jian
doaj   +1 more source

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

STERIC EFFECT IN DIFLUORINEALCANE MOLECULES [PDF]

open access: yesPhysical and chemical aspects of the study of clusters, nanostructures and nanomaterials, 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. Analysis and comparison of electron parameters revealed in some structures a steric effect from CHF2.
A.V. Kotomkin   +3 more
openaire   +2 more sources

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