| Pericyclic Reaction |
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| CATEGORIES ABOUT PERICYCLIC REACTION | |
| rearrangement reactions | |
In general, these are considered to be Equilibrium Processes , although it is possible to push the reaction in one direction by designing a reaction by which the product is at a significantly lower energy level; this is due to a unimolecular interpretation of Le Chatelier's Principle . Pericyclic reactions often have related stepwise Radical processes associated with them. Some pericyclic reactions, such as the {Link without Title} cycloaddition, are 'controversial' because their mechanism is not definitively known to be concerted (or may depend on the reactive system). Pericyclic reactions also often have metal-catalyzed analogs, although usually these are also not technically pericyclic, since they proceed via metal-stabilized intermediates, and therefore are not concerted. The 'largest' pericyclic reaction was the pi ring closure on a Corrin performed by Albert Eschenmoser . Due to the principle of Microscopic Reversibility , there is a parallel set of "retro" pericyclic reactions, which perform the reverse reaction. PERICYCLIC REACTIONS IN BIOCHEMISTRY Pericyclic reactions also occur in several biological processes.
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