Results 1 to 10 of about 256,202 (345)
Steric Effects of N-Alkyl Group on the Base-Induced Nitrogen to Carbon Rearrangement of Orthogonally Protected N-Alkyl Arylsulphonamides [PDF]
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
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Steric effects in cyclization reactions [PDF]
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
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A Highly Efficient Regioselective Addition of Acetylides to Enediones Based on Steric Effects [PDF]
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
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Electrostatic and steric effects underlie acetylation-induced changes in ubiquitin structure and function [PDF]
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
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A database of steric and electronic properties of heteroaryl substituents [PDF]
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
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Insights on tert-butyl alkylation effects on fluorobenzene
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
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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
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Steric Effects on Space Electroosmotic Thrusters in Soft Nanochannels
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
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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
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STERIC EFFECT IN DIFLUORINEALCANE MOLECULES [PDF]
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