The rate coefficient is expressed by the following Arrhenius equations: For ethyl N-benzyl-N-cyclopropylcarbamate For ethyl diphenylcarbamate The presence of phenyl and bulky groups at the nitrogen atom of the ethylcarbamate showed a decrease in the rate of elimination. Steric factor may be ...
Steric factor dependence of the structures of certain Cp-containing compounds 来自 Elsevier 喜欢 0 阅读量: 15 作者: EB Lobkovsky 摘要: A simple procedure for quantitative estimation of steric hindrance is proposed. The method suggested enables one to solve a priori the problem related to steric ...
In a molecule of the form X2A, ab initio molecular orbital calculations showed that the RAX bond distance was the major factor influencing the X–A–X angle, particularly if A is a first-row element. For example, the HOH angle widens considerably as the OH distance is reduced. Similar ...
Steric factor Steric crowding Steric strain (or steric tension) Steric interactions, whether between electrons or atoms, always result in a rise in the energy of a system. Systems with higher energies are more unstable than systems with lower energies. Figure 1 depicts cyclohexane conformations as ...
Conformational and steric effects on regioselectivity in the Baeyer–Villiger reaction The Baeyer–Villiger oxidation of six β,β,γ-trisubstituted cyclopentanones and cyclohexanones leads to preferential migration of the α-carbon relative to the α′-carbon by a factor of 1.5–4:1. The origin of...
Otherwise, an increase of alkyl–hydrogen interaction caused steric acceleration to be the determining factor.doi:10.1002/kin.550160108Carolina ArcilaMaria PinoJacek LubinkowskiJose Adan Hernandez AGabriel ChuchaniJohn Wiley & Sons, Inc.International Journal of Chemical Kinetics...
The numerical findings of the n(CPF)factor provide adequate proof of the arrangement behavior of the adsorbed CPF ions occupying the exterior surfaces of CA, AC, PANI/CA, and PANI/AC. This includes both the vertical as well as the horizontal orientations. Additionally, these outcomes are signi...
In addition, as described in the next section, sub-Å changes to ribosome sterics can decrease the rate by a factor of 12–15. Thus, minor structural fluctuations that may arise from experimental conditions (e.g. buffer, temperature) could account for an order-of-magnitude difference in ...
图4颗粒效率因子随无因次时间的变化Fig 4 Variation of effectiveness factor with dimensionless time 由表1可知, ξm1的值均接近于1 。说明催化剂颗粒的大部分体积均是进行烧炭反应的第二阶段, 因此按照反应第二阶段的效率因子表达式计算粒径不同的颗粒的效率因子,如图5所示。可以看出,催化剂颗粒很小时,效率因子...
Steric factor dependence of the structures of certain Cp-containing compounds 来自 Elsevier 喜欢 0 阅读量: 13 作者: EB Lobkovsky 摘要: A simple procedure for quantitative estimation of steric hindrance is proposed. The method suggested enables one to solve a priori the problem related to steric ...