反式异构体通常更为稳定，这并非由于对称性问题，而是因为顺式异构体中的取代基之间存在较高的位阻效应。具体而言，顺式异构体中的两个相同或相似的取代基位于分子链的同一侧，因此彼此之间的距离较近，导致位阻较大。在反式异构体中，取代基位于分子链的相对两侧，它们之间的距离较远，位阻较小。这种...
反式更稳定，不是因为对称因素，很简单的理由：是因为顺式结构取代基的位阻（离得比较近）比反式的位阻高。
The cis-trans notation does not alwayscorrespond to the EZ isomer, which is an absolute stereochemical description. In general, the character isomer cancontain a non-rotating double bond or a ring structure in whichthe rotation of the bond is restricted or prevented. Cis and transisomers occur ...
The meaning of CIS-TRANS ISOMERISM is geometric isomerism in unsaturated compounds or cyclic compounds depending usually on the presence in the molecule of a pair of substituted groups (as unsymmetrically substituted methylene groups) so that the isomers
Cisvstrans and EvsZ isomers are geometric isomers that occur when substituents arelockedin position next to or opposite each other.This is seen in both double bonds for alkenes, and substituents on ring structures. Cis alkenes are on the same size, trans alkenes are on opposite sides. When ...
Cis and trans fatty acids are geometric isomers. Cis fatty acids have hydrogen bonds on the same side of two carbon atoms which are double bonded together. Trans fatty acids are molecules with the same atoms and double bond as the cis molecules, but the hydrogens are found on opposite sides...
Cis and trans can apply to any two groups in a cyclic system, so yes, 1-bromo-2-ethylcyclohexane would have a cis and a trans isomer. Logged aficesk8ingal Guest Re:Cis/Trans Isomers « Reply #2 on: September 14, 2004, 02:31:52 PM » Thanks for the reply! Yes, actually ...
Molecular structure of the trans and cis isomers of metal-free phthalocyanine studied by gas-phase electron diffraction and high-level quantum chemical cal... The molecular structure of the trans isomer of metal-free phthalocyanine (H2Pc) is determined using the gas electron diffraction (GED) ...
Cryptand L (L = N[(CH2)(2)NHCH2(2,6-C10H6)CH2NH(CH2)(2)](3)N) and its dinuclear metal cryptates [Zn2L]-(NO3)(4) (1) and [Cu2L](ClO4)(4) (2) have been prepared, and the binding properties of the cryptates with fumarate and its cis isomer maleate were investigated using...
The relative stability of the trans and cis isomers in the square planar palladium(II) complexes Pd(I)(PPh3)(η3-XCHC(Ph)CHR) (X = H, Me, CMe3, CO2Me, P(O)(OMe)2, and SO2H; R = H, Me) was investigated with the aid of the B3LYP density functional theory calculation...