Chemistry Reference
In-Depth Information
R'
R'
R
R'
R'
R
R
R
ts
E-RPR'
ts
ta
Z-RPR'
ta
E-SMS'
Z-SMS'
R'
R
R'
R
R
R'
R'
R
ts
ts
ta
ta
E-SPS'
E-RMR'
Z-SPS'
Z-RMR'
Fig. 17 Schematic representation of the conformations ts
E-RPR
0
, ts
E-SMS
0
, ts
E-SPS
0
, ts
E-RMR
0
,
ta
Z-RPR
0
, ta
Z-SMS
0
, ta
Z-SPS
0
, and ta
Z-RMR
0
a
-
C
2h
(
y
)
au
-
C
s
(
xz
)
a
E-RS
'
-
C
i
at
Z-RPR
'
-
C
2
(
y
)
Fig. 18 Three-dimensional projections of the
anti
-folded conformations of homomerous,
heteromerous, and disubstituted BAEs including their point group symmetry operators
configuration, as indicated by the subscript
RS
0
. Thus, a
E-RS
0
-
C
i
is
meso
. The
inverted form, a
E-SR
0
-
C
i
, is superimposable by rotation and translation.
Z
-
Disubstitution leads to at
Z-RPR
0
-
C
2
(
y
), which has the same point group as ta
Z-
RPR
0
-
C
2
(
y
) (Fig.
16
). Typical examples are shown in Fig.
18
.
