Chemistry Reference
In-Depth Information
Fig. 10 Crystal structure of a [6]CPPA fullerene complex [
21
]
CHO
TiCl
4
·Zn(CuI)
DME/toluen
e
Ar
Ar
rt to reflux
Ar
CHO
1. Br
2
, CHCl
3
2.
t-
BuOK, Et
2
O
Ar
=
,
16
(16% overall)
17
(28% overall)
for
16
for
17
Fig. 11 Modified CPPA synthesis for
π
-extended hoops [
22
,
23
]
16
17
18
Fig. 12 Extended CPPAs synthesized by Kawase et al. [
22
,
23
]
3.3 Synthesis of More Reactive CPPAs
The stability of CPPAs to oxidative and polymeric decay falls with increasing
length of the polyyne segments [
27
]. As such, there is an inherent challenge in
synthesizing nanohoops with a higher ratio of sp to sp
2
carbons, approximating the
