cis，trans按基团的相同或相似性来定，相同或相似基团在同侧为顺（cis）,异侧为反（trans）。一般象...
If we go back to our cis/trans practice problems, such as cis and trans 2-butene, you’ll see that we can use the E/Z system here as well. Carbon 2 and 3 each have a methyl group outranking a hydrogen atom. When they are cis, you get Z. When they are trans you get E. A ...
1.cis/trans和Z/E属于两套体系,不等平行考虑,不存在包含与被包含的关系。2.cis/trans只适用于1,2-双取代乙烯。这一点本人保留意见,我觉得有时候AB/AC型的烯烃也可以这么表示。3.Z/E在理论上是普适的,也是IUPAC规范的表示方法。对于它,问题似乎是清晰的。 14楼2012-02-18 13:32 回复 沥青120 量子...
Voltammetric reduction of the adsorbed species allows recognition of the cis (Z) and trans (E) forms of the azo-crowns because their reduction potentials in alkaline solutions are different. In the region below pH 10 fast isomerization follows the first electron transfer, hence both forms appear ...
【题目】写出下列物质的结构式:(1)(E)-2甲基 -3-己烯(trans)2)(S)-3氯 -1-戊烯(3)(R),(Z)-2-氯 -3-庚烯(cis)
The cyclosporin A binding protein, cyclophilin (CyP), and the FK-506 binding protein, FKBP, catalyze the cis-to-trans isomerization of Xaa-Pro bonds in peptides. To probe the mechanism of these reactions and their nonenzymatic counterparts, we determined the following: (1) substrate specificitie...
Conformational Preferences and cis−trans Isomerization of Azaproline Residuedoi:10.1021/jp067826tThe conformational study of N-acetyl-N'-methylamide of azaproline (Ac-azPro-NHMe, the azPro dipeptide) is carried out using ab initio HF and density functional methods with the self-consistent ...
In addition to these direct effects on lesion-stalled Pol II (effects in cis), accumulating evidence shows that transcription, and particularly Pol II, is also affected in a genome-wide manner (effects in trans). We will summarize the diverse consequences of DNA damage on transcription, ...
3b). Many AJUBA single mutations have much larger effects (Z-score < −3) than single mutations in NEIL1 and TTYH2. This difference may be explained by the long distance (524 nt) between AJUBA editing strand and ECS, such that mutations may lower the probability of forming this...
are closely related chemically to the phenothiazines. The major structural difference is that the nitrogen at position 10 in the phenothiazines is replaced by a carbon atom with a double bond to the side chain, as shown in the chemical structure of flupenthixol, which has a double-bonded carb...