Illustrated Glossary of Organic Chemistry
Stereoisomer (configurational isomer):
One molecule in a set of
isomers
that differ by the position of atoms in space, but are not
constitutional isomers
or
conformational isomers
. Stereoisomers are either
enantiomers
or
diastereomers
.
Stereoisomer examples.
Verify with
models
.
(
R
)-2-butanol and (
S
)-2-butanol are
enantiomers
.
(1
R
,2
R
)-2-chlorobromo
cyclohexane
and (1
S
,2
R
)-2-chlorobromo
cyclohexane
are
diastereomers
.
These representations of
cis
-1,2-dichloro
cyclohexane
are
identical; they are not stereoisomers. This is a
meso compound
.
Related terms:
Conformer
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