Chemistry Reference
In-Depth Information
h
h
S
0
*
S
0
**
20
IC
IC
+ other products
Scheme 6 Proposed mechanism of two-photon photoreactivity of 20 [
44
]
C-C bond
cleavage
H
rotation and
H abstraction
R
R
R
R
H
R
R
H abstraction
and rotation
R
R
bond formation
R
R
H
Scheme 7 Mechanism of phenyl group migration in FVP of phenylene-containing PAHs [
47
-
49
]
FVP
28
30
31
FVP
22
21
FVP
29
32
Scheme 8 FVP of 28, 21, and 29 [
47
-
50
]
In addition to hydrogenation as shown in Scheme
4
, it has been demonstrated that
the central benzene ring in angular [3]phenylene (22) is susceptible to a number of
reactions (Scheme
9
)[
51
]. The 2,3,8,9-tetrakis(trimethylsilyl)-substituted 22 can be
tris-epoxidized (Scheme
9
a) analogously to the reactivity of
triangular
[4]
