Chemistry Reference
In-Depth Information
Fig. 3 Representative molecular belts (clockwise from top
left
, cyclocarbon, cyclophenacene,
picotube, cyclacene, cycloparaphenylene, and cycloparaphenyleneacetylene)
hv
benzen
e
16%
+
TDDA
2
4
3
Fig. 4 Picotube synthesis from TDDA [
7
]
obtained [
10
]. In addition to the milestone synthesis, this picotube has attracted the
interest of chemists studying its novel vibrational and spectroscopic properties
[
11
-
13
].
3 Cycloparaphenyleneacetylenes
Cycloparaphenyleneacetylenes (CPPAs) are hydrocarbon belts consisting of alkyne
and phenyl moieties in differing proportions. By breaking up longer polyyne chains,
responsible for the high reactivity of the cyclocarbons, with phenyl rings, one
arrives at more stable hydrocarbon macrocycles [
4
,
14
].
