Concerted Reaction

A concerted reaction is a reaction in which 1) # covalent bonds broken + #covalent bonds formed > 1, 2) # steps = 1.

eg. 1:



mechanism:  The reaction is a nucleophilic aliphatic substitution occurring via SN2 mechanism.



# covalent bonds broken = 1
# covalent bonds formed = 1
# covalent bonds broken + # covalent bonds formed = 1 + 1 = 2
# steps = 1

Thus, the reaction is a concerted reaction.

eg. 2:



mechanism:  The reaction is an electrophilic addition.



# covalent bonds broken = 2
# covalent bonds formed = 2
# covalent bonds broken + # covalent bonds formed = 2 + 2 = 4
# steps = 1

Thus, the reaction is a concerted reaction.

see also pericyclic reaction

Print Friendly