Results 11 to 20 of about 11,302,873 (322)
Micromachines, 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
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UNA PROPUESTA PARA ENSEÑAR EL EFECTO DE LA FORMA DE LAS MOLÉCULAS EN LA REACTIVIDAD QUÍMICA
Química Nova, 2015 We address the concept of steric effect in the pursuit of establishing quantitative correlations between reactivity of molecules and their molecular shape.
José G. Cermeños-Estrada +2 more
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Steric Effects on Electroosmotic Nano-Thrusters under High Zeta Potentials
Mathematics, 2021 Here, space electroosmotic thrusters in a rigid nanochannel with high wall zeta potentials are investigated numerically, for the first time, considering the effect of finite size of the ionic species. The effect, which is called a steric effect, is often
Jiaxuan Zheng, Siyi An, Yongjun Jian
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Iridium-Catalyzed Silylation of Five-Membered Heteroarenes: High Sterically Derived Selectivity from a Pyridyl-Imidazoline Ligand. [PDF]
, 2020 The steric effects of substituents on five-membered rings are less pronounced than those on six-membered rings because of the difference in bond angles. Thus, the regioselectivities of reactions of five-membered heteroarenes that occur with selectivities
Hartwig, John F +3 more
core +1 more source
Molecules, 2001 Benzonorbornadiene 21, 7-spirocyclopropylbenzonorbornadiene 23, 7,7-dimethylbenzonorbornadiene 25, and 7-spirocyclopentylbenzonorbornadiene 27 have been reacted with 3,6-di(2-pyridyl)-s-tetrazine (rate: 21>23>25=27) to form symmetrical 4,5 ...
Peter A. Harrison, Ronald N. Warrener
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El Niño, La Niña, and the global sea level budget [PDF]
Ocean Science, 2016 Previous studies show that nonseasonal variations in global-mean sea level (GMSL) are significantly correlated with El Niño–Southern Oscillation (ENSO).
C. G. Piecuch, K. J. Quinn
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Steric control of regiochemistry in the reactions of methyl substituted pentadienyl cations with isobutene [PDF]
, 1986 The dienylic chlorides 1–5 react with isobutene in the presence of zinc chloride/ether in dichloromethane to give the acyclic adducts 6–10 in 64–91% yield.
Bates +38 more
core +1 more source
Acceleration of diels-alder reactions by remote methyl groups [PDF]
, 1989 The hexamethyl substituted bismethylenecyclopentane 1a is 4 to 7 times more reactive towards the acetylenic dienophiles 2 and 3 than the nonmethylated 1,2-bismethylenecyclopentane 1b.
Baran +23 more
core +1 more source
Kinetics of the reaction of 5-substituted orotic acids with diazodiphenylmethane [PDF]
Journal of the Serbian Chemical Society, 2004 Rate konstants for the reaction of eight 5-substituted orotic acids with diazodiphenylmethane (DDM) in dimethylformamide (DMF) were determined at 30 ºC by the known spectrophotometric method.
ALEKSANDAR D. MARINKOVIC +2 more
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Insights on tert-butyl alkylation effects on fluorobenzene
Scientific 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
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