Illustrated Glossary of Organic Chemistry
Syn:
Atoms,
groups
, or other
moieties
pointing in the same direction. Syn entities have a
dihedral angle
of less than 90
o
.
The two
methyl groups
are syn and
eclipsed
in the
syn-periplanar
conformation
of
butane
. Verify the
CH
3
/
CH
3
dihedral angle
of 0
o
with a
molecular model
.
This
catalytic hydrogenation reaction
is a
syn addition
.
Related terms:
Gauche
,
staggered
,
cis
,
trans
,
E
,
Z
,
anti addition
,
Newman projection
,
anti-periplanar
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