Chemistry Reference
In-Depth Information
Fig. 38 Schematic
mechanism for the
interconversion of the t-
D
2
twisted and s-
C
2v
(
x
)
syn
-
folded conformations via a
transition state ft-
C
1
1'
s
1
Z-RS'
1'
1'
1
1
ft
ft
Z-RMS'
Z-RPS'
1
1
1'
1'
ft
ft
Z-RMS'
Z-RPS'
1'
1
1'
1'
1'
1
t
1
t
Z-P
1
Z-M
ft
ft
Z-SPR'
Z-SMR'
1
1
1'
1'
1
ft
ft
Z-SPR'
Z-SMR'
1'
s
Z-SR'
1'
s
1
E-RR'
1'
1'
1
1
ft
ft
E-RPR'
E-RMR'
1
1
1'
1'
ft
ft
E-RPR'
E-RMR'
1
1'
1'
1'
1
1'
t
1
t
E-P
1
E-M
ft
ft
E-SMS'
E-SPS'
1
1
1'
1'
ft
ft
1
E-SMS'
E-SPS'
1'
s
E-SS'
Table 23 Symmetry analysis of the
anti
-folded to
syn
-folded conformational isomerization
Permutation-inversion operators
E
, (11
0
)(88
0
)(99
0
), (18)(1
0
8
0
)*, (18
0
)(81
0
)(99
0
)*
Symmetry operators of a-
C
2h
(
y
)
E
, (18
0
)(81
0
)(99
0
), (18)(1
0
8
0
)*, (11
0
)(88
0
)(99
0
)*
Symmetry operators of s-
C
2v
(
x
)
E
, (18)(1
0
8
0
)*
Largest common subgroup
4.3.6
Interconversion of the
anti
-Folded and
syn
-Folded Conformations
The permutation-inversion operators of the
anti
-folded and the
syn
-folded confor-
mations, a-
C
2h
(
y
) and s-
C
2v
(
x
), and their largest common subgroup are shown in
Table
23
.
