Chemistry Reference
In-Depth Information
Tab l e 9 . 7
Substrate
Product
Yield (%)
R
R
Z
Z
O
Z
R
C(CO
2
Et)
2
C(CO
2
Et)
2
O
O
NTs
NTs
Bu
Ph
Bu
Ph
Me
Bu
82
92
89
87
81
91
O
+
R
R
R
Bu
Ph
TMS
cyclohexyl
60
63
65
68
O
+
Ph
59
R
Using
Co
2
Rh
2
nanoparticles as the catalyst, aldehydes proved to be effective, but 2-
pyridylmethyl formate was not (Scheme 9.13). Among the aldehydes,
-unsaturated
aldehydes such as cinnamaldehyde, crotonaldehyde and acrolein gave good results. The
reusability test of the catalytic system showed that the catalytic activity was retained for at
least five runs.
α
,
β
Ph
Ph
Co
2
Rh
2
O
O
O
+ "CO"
130
°
C, 18 h, THF
"CO".
Acrolein
Crotonaldehyde
Cinnamaldehyde
Benzaldehyde
1-naphthaldehyde
2-pyridylmethyl formate
Yield (%)
87
93
91
43
35
0
Scheme 9.13
