Chiral Separation and Enantiomer Resolution (5C)
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QUESTION
Find
e
e
ee
ee
if
α
o
b
s
=
−
5
∘
\alpha_{obs}=-5^\circ
α
o
b
s
=
−
5
∘
and
α
p
u
r
e
=
−
10
∘
\alpha_{pure}=-10^\circ
α
p
u
r
e
=
−
1
0
∘
for the pure enantiomer.
QUESTION
Calculate
α
o
b
s
\alpha_{obs}
α
o
b
s
if
α
p
u
r
e
=
+
20
∘
\alpha_{pure}=+20^\circ
α
p
u
r
e
=
+
2
0
∘
and
e
e
=
0.60
ee=0.60
ee
=
0.60
(fraction).
QUESTION
Identify the mixture composition (major enantiomer) if
e
e
=
20
%
ee=20\%
ee
=
20%
in favor of
R
R
R
.
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ANSWER
60
%
R
60\%\,R
60%
R
and
40
%
S
40\%\,S
40%
S
. A 20% excess means the major enantiomer is 10% above 50%, with the minor 10% below.
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