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Mesoionic compound
Meaning
Noun
●
In Chemistry:
any of a
class
of
compounds
having five-membered
ring
heterocycles
(or their
benzo
derivatives
) which
possess
a
sextet
of π-electrons in
association
with the
atom
s
comprising
the
ring
, but which cannot be
represented
by
any one
covalent
or
polar
structure;
typically
the
ring
structure
contains
both positive and
negative
delocalised
charges
which cannot be associated with
any one
ring
atom
, and the
negative
charge
can also be associated with a
conjugated
exocyclic
atom
(typically
oxygen
,
sulfur
, or nitrogen).
Sourced from
Wiktionary
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