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FIGURE 6.12
3D polyynes serving as organic precursors of C
60
and C
78
.
loss of chlorine atoms was observed, leading ultimately to C
60
. The pre-
parative scale synthesis of C
60
has not been achieved yet by this route,
although Scott et al. recently succeeded in the synthesis of C
60
by high-
temperature pyrolysis of a polycyclic aromatic chlorohydrocarbon [53].
However, Tobe has shown that the polyyne route can be extended to the
size-selective formation of a large fullerene C
78
[54]. Regarding large fullere-
nes, it has been well known that the number of possible geometrical isomers
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