ChemInform Abstract: CHEMISTRY OF CIS- AND TRANS-2,3-DI-TERT.-BUTYLTHIIRANES (EPISULFIDES). SOME OBSERVATIONS ON THE CONSEQUENCES OF STERIC OVERCROWDING IN SMALL RING COMPOUNDSheterocyclic 3-membered ringssulfenic acidssulfinic acids (acyclic compounds)...
基本反应(3)Hydrogenation加氢反应 加氢反应有两类,cis,trans的烯烃产生方式不同。cis alkene显然来自于syn-addition。这个是鼎鼎大名的Lindlar's Catalyst的结果。trans alkene的制备比较高级一点。属于Dissolving Metal Reduction, 同样的还有Birch Reduction(伯奇还原)。 合成案例(1): 合成案例(2): 最后提一嘴诺奖成果...
In isomerism: Cis and trans forms The examples presented so far have concentrated on the simplest organic molecules, the alkanes. However, stereoisomers crop up in many of the other structural types of organic chemistry. For example, in the alkenes, two versions of 2-butene exist. They are ...
Superior conditions for the isomerisation of (–)-humulone into (+)-cis- and (–)-trans-isohumulone are described, together with a highly effective separation on Kieselgel H. The isohumulones are fully characterised for the first time, the mechanism of their formation is discussed, and their ...
The reaction of hex-1-yne with triethylsilane is catalysed by RhCl(PPh3)3 to give cis- and trans-n-C4H9CH CHSiEt3 as major products, the former favoured by decrease in the catalyst concentration, increase in the temperature or increase in the silane/alkyne ratio. The trans-product isomeri...
dehydrohalogenation, and (Mo2O3Br4 phen2) and (Mo2O4Br2phen2) were isolated by hydrolysing the parent salt.The compound (MoOBr3.phen) has been isolated in two coloured forms (red and deep chocolate) expected to be the two stereoisomeric varieties cis- and trans-, as evidenced by their...
为了验证反应是否经历1,3-钯迁移过程,作者选用带有乙基的底物trans-1b作为起始原料。如果反应经历了1,3-钯迁移过程,则应该可以观察到连有甲基的四环产物(经历C-H键活化和还原消除)或者连有烯基的四环产物(经历β-H消除)生成(Fig. 3a)。实验结果表明,不论作者选用trans-1b还是cis-1b作为起始原料,分别仅以73%...
and MARCHAND, G. R. (1991), ChemInform Abstract: cis,trans-1,1′-Bicyclohexenyl: Conformer-Dependent Chemistry in Benzene and in Methanol. ChemInform, 22: no. doi: 10.1002/chin.199129078 Author Information Dep. Chem., Fla. State Univ., Tallahassee, FL 32306-3006, USA Publication History ...
Polymerization methods that control the cis/trans stereochemistry of repeating alkenes in polyalkenamers remain scarce. Now, an acyclic diene metathesis process has been developed that enables control over the stereochemistry of the polymer backbone. The method harnesses the reactivity of dithiolate Ru ca...