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E-Z notation
E
-
Z
configuration
, or the
E
-
Z
convention
, is the
IUPAC
preferred method
of describing the
absolute
stereochemistry
of
double bonds
in
organic chemistry
. It is an extension of
cis/trans
notation (which only describes
relative stereochemistry
) that can be used to describe double bonds having two, three or four
substituents
.
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