a A
A Ac
b Br
c C
C Cl
d D
e Et
E COOCH3
f F
h H
i I
k K
l Cl
m Me
n N
N Na
o O
p P
P Ph
q Q
r R
s S
S Si
t TMS
T OTs
x X
1 n-Bu
2 s-Bu
3 t-Bu
4 Ph
5 Ac
6 CH2OH