In chemistry, a concerted reaction is a chemical reaction in which all bond breaking and bond making occurs in a single step. Reactive intermediates or other unstable high energy intermediates are not involved. Concerted reaction rates tend not to depend on solventpolarity ruling out large buildup of charge in the transition state. Pericyclic reactions are concerted reactions. For other uses, see Chemistry (disambiguation). ... For other uses, see Chemical reaction (disambiguation). ... In chemistry a reactive intermediate is a short-lived high energy highly reactive molecule. ... Iron rusting - a chemical reaction with a slow reaction rate. ... For other uses, see Solvent (disambiguation). ... The polarity of an object is, in general, its physical alignment of atoms. ... Electric charge is a fundamental property of some subatomic particles, which determines their electromagnetic interactions. ... The transition state of a chemical reaction is a particular configuration along the reaction coordinate. ... In organic chemistry, a pericyclic reaction is a type of reaction where the transition state of molecule has a cyclic geometry, and the reaction progresses in a concerted reactions fashion. ...
In the SN2 reaction a concerted reaction also takes place. Because the reaction rate is bimolecular there are two molecular species controlling the rate of the reaction. Because the rate is dependent on two molecules the reaction does not have any intermediate steps, only a transition state. This means that all the bond making and bond breaking takes place in a single step. In order for the reaction to occur both molecules must be situated correctly. Therefore, the reaction is said to be concerted because it occurs in one step. In chemistry, nucleophilic subsitution is a type of chemical reaction in which one nucleophile (electron donor) replaces another as a covalent substituent of some atom. ... Iron rusting - a chemical reaction with a slow reaction rate. ... The transition state of a chemical reaction is a particular configuration along the reaction coordinate. ...
References
Carey, Francis A.; Sundberg, Richard J.; (1984). Advanced Organic Chemistry Part A Structure and Mechanisms (2nd ed.). New York N.Y.: Plenum Press. ISBN 0-306-41198-9.
An electrocyclic reaction is the concerted cyclization of a conjugated π-electron system by converting one π-bond to a ring forming σ-bond.
The sterospecificity of this reaction is demonstrated by closure of the isomeric trans,cis,cis-triene to trans-5,6-dimethyl-1,3-cyclohexadiene, as noted in the second example.
The diene reactant in the third reaction is drawn in an extended conformation.
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