Illustrated Glossary of Organic Chemistry
Ipso hydrogen:
In an
electrophilic aromatic substitution reaction
, the hydrogen
bonded
to the
arenium ion
carbon that is the site of attack by the incoming
electrophile
. In a traditional
electrophilic aromatic substitution reaction
, the ipso hydrogen is the hydrogen replaced by the new
substituent
(from the attacking
electrophile
) in the final product.
In this
electrophilic aromatic
bromination
reaction, the hydrogen replaced by bromine in the final
product
was the ipso hydrogen of the
arenium ion
.
Related terms:
Ortho
,
meta
,
para
,
ipso substitution
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