Endo–exo isomerism

Stereoisomerism found in bridged-ring compounds

Comparison of endo-norborneol (left) and exo-norborneol

In organic chemistry, endo–exo isomerism is a special type of stereoisomerism found in organic compounds with a substituent on a bridged ring system.[1] 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 the isomer with the substituent located farthest, or "anti", to the longest bridge. Here "longest" and "shortest" refer to the number of atoms that comprise the bridge. This type of molecular geometry is found in norbornane systems such as dicyclopentadiene.

The terms endo and exo are used in a similar sense in discussions of the stereoselectivity in Diels–Alder reactions.

## References

[edit]

1. ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006-) "endo, exo, syn, anti". doi:10.1351/goldbook.E02094

* v
* t
* e

Stereochemistry

Topics|

* Chirality
* Racemic mixture

Configuration descriptors|

| cis–trans isomerism|

cis-, trans-

|

E-Z notation|

(E)-, (Z)-

Arene substitution pattern|

o-, m-, p\- (ortho, meta, para)

Endo-exo isomerism|

endo, exo

Syn and anti addition|

syn, anti

Three identical ligands|

fac, mer (facies, meridonal) [obsolete]

In carbon skeletons|

n, iso, neo, cyclo

Secondary and tertiary|

sec-, tert-

Spiro compound|

spiro

Catenane|

catena

Absolute configurations|

| CIP (Cahn–Ingold–Prelog) priority rules|

(R), (S)

|

Pseudoasymmetric (pseudochiral) centers|

(r), (s)

Optical rotation|

(+)-, (−)- or d-, l-

Relative configuration|

D-, L-

Octahedral propeller twist|

Λ-, Δ-

Category:Stereochemistry

This stereochemistry article is a stub. You can help Wikipedia by expanding it.

|

* v
* t
* e

*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template