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
Dimethyl sulphoxide proved to be a good solvent for the diaxial cleavage of epoxides by alkali, while hydrolysis in the same solvent under acidic conditions led to the diaxial glycol 7 from the trans epoxide 3, and to the di... G Berti,B Macchia,F Macchia - 《Tetrahedron》 被引量: 63...
1 using estimations for 1,3-diaxial strain (0.9 kcalmol?1), methyl/hydrogen allylic strain (1.3kcalmol?1), and methyl/methyl allylic strain (7.6 kcalmol?1) values. HYPERLINK /wiki/Allylic_strain \l cite_note-J1968-2#cite_note-J1968-2 [2] The strain energy in 1,8-dimethyl...
The strain energy for methylenecyclohexane has been calculated to be 4.5 kcalmol−1using estimations for 1,3-diaxial strain (0.9 kcalmol−1), methyl/hydrogen allylic strain (1.3kcalmol−1), and methyl/methyl allylic strain (7.6 kcalmol−1) values.[2] The strain energy in 1,8-...
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 ...
合成化学Chapter 2-1 Chapter2FormationofCarbon-CarbonSingleBonds §2-1烷基化反应(Alkylation)碳负离子形成条件Carbonanion 2 a.反应底物(Substrate)使其-碳上的H活化的基团,通常为吸电子基(Electronwithdrawinggroup—EWG)。-NO2>-COR>SO2R>-CN>-CO2R>-Ph,SOR 具有一个及以上的EWG 3 当溶剂的pKa...
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 ...
Toward Frameworks with Multiple Aligned and Interactive Fe(CO)3 Rotators: Syntheses and Structures of Diiron Complexes Linked by Two trans-Diaxial α,ω-Diphosphine Ligands Ar2P(CH2)nPAr2 Reactions of (η4-benzylideneacetone)Fe(CO)3and the α,ω-diphosphines Ar2P(CH2)nPAr2afford the trigonal...
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...
delta/Malm epsilon interval. For this interval, an widespread subaerial exposure of Upper Jurassic carbonates is indicated by the absence of marine-phreatic cements, the occurrence of meteoric-vadose meniscus cements, meteoric-phreatic granular to blocky cements, and of asymmetric radiaxial-fibrous ...