百度试题 结果1 题目翻译“1,3-diaxial interaction”(化学专有名词).有机里面的.相关知识点: 试题来源: 解析 1,3-双轴向相互作用 反馈 收藏
Amide bond cleavage: acceleration due to a 1,3-diaxial interaction with a carboxylic acid. 来自 ACS 喜欢 0 阅读量: 135 作者:Gerschler, JJ,Wier, KA,Hansen, DE 摘要: To independently assess the contribution of ground-state pseudoallylic strain to the enormous rates of amide bond cleavage in...
A table providing the energy values of1,3-diaxial interactions of a variety of substituents with a single hydrogen atom is provided below. A gauche interaction increases the strain in the molecule by3.8kJ/mol.Calculate the strain in the most ...
1,3-disubstitution A-values are only additive in the trans-diastereomer: When there are cis-substituents on the chair, there is a new interaction in the di-axial conformation: In the above example, each methyl group has one 1,3-diaxial interaction with a hydrogen. The methyl groups ...
Moreover, Pin1 and Par14 have been found to be active in similar cellular events and pathways as summarized in Table 3. These are indications, that there might be a cross-talk of both parvulins. However, the detailed cellular processes underlying such a putative cross-talk and the ...
positions and orientations relative to the substrate suggest that the enzyme likely imposes an unfavorable constraint on the native substrate IGA. Here, aromatization alters the pseudodiaxial conformation, elongating the C3-O distance, placing strain on the IGA substrate to break the C-O bond, and...
A two-step mechanism has been proposed that indicates that the catalytic process proceeds via trans-diaxial elimination of the 1α,2β hydrogen atoms from a 3-ketosteroid substrate [30]. Interaction of the C3 carbonyl group of a steroidal substrate with an electrophile promotes labilization of ...
In the case of the CIS molecule, presumably, the same large values of this constant (11.1 Hz) between the H6α proton and protons H5 and H7 indicate their trans-diaxial arrangement in the studied molecule, while the small unequal values of the constants of protons H5 and H7 with the H6...
The small coupling constant reflects the interaction between 4-Hax and the equatorially-oriented 5-H. The remaining coupling constant of 11 Hz can only be explained by an 1,2-diaxial position of adjacent protons. Therefore, the proton in the 3-position has to adopt an axial orientation ...