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...
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-...
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. [2] The strain energy in 1,8-dimethylnaphthalene was calculated to be 7.6 kcalmol −1 and around 12...
In c these 1,3 diaxial interactions will be lower.In addition, the larger your base is, the more reactive would be c respect to a towards an E2 reaction. Logged orgopete Chemist Sr. Member Posts: 2636 Mole Snacks: +213/-71 Re: Which SN1 reaction occurs faster? « Reply #6 on...
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...
烯丙位张力 (也被称为1,3-烯丙位张力) Allylic strain (also known as A1,3 strain, 1,3-allylic strain, or A-strain) in HYPERLINK /wiki/Organic_chemistry \o Organic chemistry organic chemistry is a type of HYPERLINK /wiki/Strain_energy \o Strain energy strain energy resulting from the inte...
Nonclassical carbocation 非经典碳正离子Carbanion 碳负离子Masked carbanion 掩蔽碳负离子Carbenoid 卡宾体Carbene 卡宾Nitrene 氮宾Carbine 碳炔Electrophilic addition 亲电加成Electrophile 亲电体Diaxial addition 双直键加成Markovnikov’s rube 马尔科夫尼科规则Anti-Markovnikov addition 反马氏加成Michael addition 迈克尔加成...
In E allylic alcohols, a 1,3-diaxial ... G.William Daub,James P.Edwards,Carol R.Okada - 《Journal of Organic Chemistry》 被引量: 109发表: 1997年 Towards the total synthesis of clerodin. Part I synthesis, insect control, stereochemistry, antifeedantsIn a model study aimed at the total...
Konformationsanalyse, XIII1) Umformung von 1,6‐Anhydro‐β‐D‐glucopyranose‐Ringen in Bootkonformationen durch polare 1,3‐diaxiale Wechselwirkungen. Synthese der 2,4‐Diamino‐1,6‐anhydro‐2,4‐didesoxy‐β‐D‐glucopyranose Treatment of 1,6:3,4-dianhydro-2-O-p-tolylsulfonyl-- D...
Axial substituents point straight up and down, less stable equatorial substituents in the plane of the molecule, more stable what happens to hydrogens when you flip a chair conformation axial hydrogens become equatorial and vice versa diaxial interactions steric interactions between axial substituentsde...