E1 &E2 mechanism, sandmeyer and benzyne mechanism

Elimination reaction mechanism

1. Dr. L. Sakthikumar M.Sc., M.Phil.,Ph.d
Assistant professor in Chemistry,
Saiva Bhanu Kshatriya College,
Aruppukottai – 626101,
Tamilnadu
E-mail : [email protected]
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6. Sandmeyer reaction is a type of radical-
nucleophilic aromatic substitution reaction. It is a
useful tool by which an amino group on an
aromatic ring is replaced with different
substituents. During the Sand meyer reaction, the
amino group is converted into a diazonium salt
that can be transformed into various functional
groups using a catalyst.
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10. •The reaction of halobenzenes with strong basic
condition under KNH
2 in liq.NH
3 yielded Aniline by
following elimination-addition mechanism.

•The mechanism is followed by the elimination of
alpha hydrogen with respect to the halogen atom in
the first step leads to the formation of the
intermediate benzyne and the addition of amide
anion on the intermediate yielded the aniline as a
final product.

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