t-Bu
t-Bu
SiMe
3
SiMe
3
t-Bu
t-Bu
Me
3 Si
SiMe
3
t-Bu
t-Bu
t-Bu
t-Bu
C
12 H
25 O
OC
12 H
25
OC
12 H
25
C
12 H
25 O
C
12 H
25 O
C
12 H
25 O
OC
12 H
25
OC
12 H
25
(S)-21
(S)-22
(S)-23
(S)-24
Fig. 9.7
CPL-active chiral cyclophanes
204
T. Ikeda and T. Haino