Chemistry Reference
In-Depth Information
The following represents a concerted reaction mechanism:
This is an example of a Claisen rearrangement and occurs through a concerted
reaction mechanism. As illustrated, concerted mechanisms can be described
either by movement of electron pairs or by movement of single electrons.
However, these mechanisms are generally represented by movement of electron
pairs using double-barbed arrows as is done for heterolytic reaction mechanisms.
Although, mechanistically, the movement of electron pairs is preferred over
the movement of single electrons, both processes are illustrated below using
arrow pushing:
The following represents a heterolytic-type reaction mechanism:
This is an example of a cation-
p
cyclization. Note that unlike the previously
described heterolytic reaction mechanisms, this reaction is influenced by a positive
charge. Also, please note that
this reaction shares some characteristics with
