ze是按顺序规则定的,按顺序规则优先的两个基团在同侧为z,异侧为e。 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)。一般象烃基和烃基,卤素和卤素就分别称为相似基团。但如果两个烯碳上 四个基团为四个不同的烃基,就没办法定顺反了,只能用ze 3 评论0 举报 相关...
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...
这是立体异构体中的命名，Z，E；顺，反是从不同角度来命名立体异构体的，并不是Z型就对应CIS。将双键碳原子上的取代基按次序规则分别排列，较优基团在前，当两个碳原子上的较优取代基在双键同一边是Z构型，反之为E构型。顺反命名是看相同的取代基在双键同一边的为顺，在两边的为反。由于顺反只...
Cis vs Trans Isomers and E vs Z Isomers. What are they, what's the difference and when to use each case. This tutorial will give you a detailed understand of when and how to use each of these isomers in your organic chemistry course. From understanding g
假设是一个含有碳碳双键的消旋体,在双键附近的基团排列在trans和cis状态下就有不同的表示方法。我们可能会用类似E - Z命名法中的规则来体现这种区别。例如,如果是一个简单的卤代烯烃,在trans状态下,卤素原子和另一个基团在双键的两侧,那在表达式里就要准确地写出这种相对位置关系。在cis状态下,它们在同一侧,也...
Re: (E,Z) vs (cis,trans) naming « Reply #3 on: January 30, 2013, 03:12:55 AM » cis/trans can be ambiguous in the case of tri- or tetra-substituted alkenes because the naming is not strictly associated with priority rules - hence E/Z is preferred.Ambiguity is also a probl...
UNIVERSAL CIS-TRANS AZIRIDINATIONS.The article reports on a study, in which a previously reported aziridination reaction's diastereoselectivity was switched from cis to trans by replacing their starting material's ester functional group with an amide.B.H.Chemical & Engineering News...
Recent RNA-seq based methods have been developed to more fully determine the contribution ofcisandtrans-acting factors to gene expression. By comparing the gene expression differences between two genetically distinct organisms to the gene expression difference among the alleles in the F1 offspring, we...
Furthermore, HEK 293 cells expressing the ElK1 trans-reporting plasmids displayed 2.7-fold greater luciferase response to V-LH than WT-LH, documenting stimulation of the mitogen-activated protein kinase (MAPK) pathway. The in vivo half-life of V-LH was clearly faster (5-9 min) than that ...