ring isomerism

См. также в других словарях:

• isomerism — /uy som euh riz euhm/, n. 1. Chem. the relation of two or more compounds, radicals, or ions that are composed of the same kinds and numbers of atoms but differ from each other in structural arrangement (structural isomerism), as CH3OCH3 and… …   Universalium

• ring-chain isomerism — noun : isomerism between a cyclic and an open chain form especially when the two forms are tautomeric …   Useful english dictionary

• isomerism — The existence of a chemical compound in two or more forms that are identical with respect to percentage composition but differ as to the positions of one or more atoms within the molecules, as well as in physical and chemical properties.… …   Medical dictionary

• Cis-trans isomerism — In chemistry, cis trans isomerism or geometric isomerism or configuration isomerism is a form of stereoisomerism describing the orientation of functional groups within a molecule. In general, such isomers contain double bonds, which cannot rotate …   Wikipedia

• Cis–trans isomerism — Cis but 2 ene Trans but 2 ene In organic che …   Wikipedia

• Conformational isomerism — Conformers of butane, shown in Newman projection. The two gauche as well as the anti form are staggered conformations In chemistry, conformational isomerism is a form of stereoisomerism in which the isomers can be interconverted exclusively by… …   Wikipedia

• Toroidal ring model — The toroidal ring model, known originally as the Parson magneton or magnetic electron, is also known as the plasmoid ring, vortex ring, or helicon ring. This physical model treated electrons and protons as elementary particles, and was first… …   Wikipedia

• Endo-exo isomerism — is a special type of isomerism found in organic compounds with a substituent on a bridged ring system. The prefix endo is reserved for the isomer with the substituent located closest, or syn, to the longest bridge. The prefix exo is reserved for… …   Wikipedia

• geometric isomerism — noun A form of isomerism in which, in one isomer two atoms or groups are on the same side of the plane of a double bond or ring, whereas in the other isomer they are on opposite sides; the first is the cis and the second the trans isomer. Syn …   Wiktionary

• cis-trans isomerism — /ˌsɪs trænz aɪˈsɒmərɪzəm/ (say .sis tranz uy somuhrizuhm) noun a form of isomerism occurring in a molecule which is rigid because it contains a double bond or ring system. The cis isomer has specific groups on the same side, and the trans isomer… …  

• geometric isomerism — noun : stereoisomerism ascribed to different directional arrangements of specifically located groups in the molecule and usually considered to be caused by prevention of free rotation in parts of the molecule (as by a double bond or a ring)… …   Useful english dictionary