Illustrated Glossary of Organic Chemistry
S
:
(1) Designation of the
absolute configuration
of a
stereocenter
at which the
Cahn-Ingold-Prelog priorities
of the attached
groups
decrease in a counterclockwise manner when viewed along the
bond
between the
stereocenter
and the
lowest priority
group
, with the
lowest priority
group
pointing away from the viewer. From Latin
sinister
, to the left.
Cahn-Ingold-Prelog priorities
:
HO
>
CH
3
CH
2
>
CH
3
> H, so this is (
S
)-
2-butanol
.
(2) Indicates an attachment to a sulfur atom. Compare with
N
, which means attachment to a nitrogen atom.
S
-adenosyl methionine
(
SAM
)
S
means the
adenosine
group
is
bonded
to the sulfur atom of
methionine
.
Related terms:
R
,
D
,
L
,
E
,
Z
,
s-
cis
,
relative configuration
,
enantiomer
,
diastereomer
,
sulfonium salt
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