Numbering of Fullerenes (IUPAC Recommendations 2004)

3.2.4. Systematic numbering for (C34-C2v)[4,6]fullerene

Continued from 3.2.3. Systematic numbering for (C32-Oh)[4,6]fullerene

3.2.4. Systematic numbering for (C34-C2v)[4,6]fullerene (Fig. 18).

This fullerene contains one C2 axis intersecting the midpoint of a six-membered ring at the near end and of a 6,6 bond at the far end (Fig. 18a). The six atoms of the ring form two sets of symmetry-equivalent atoms: a/a' and b/b'/b"/b'''. Three pathways must be considered: a to b to b'; b to b' to a'; and b to a to b". These lead to discontiguous numberings terminating at positions 20, 28 (Fig. 18b), and 25, respectively. The two atoms z and z' (Fig. 18a) connected by the bond at the far end of the axis are symmetry-equivalent. The pathway from z becomes discontiguous at position 32 (Fig 18c), and is therefore preferred on the basis of Fu-3.2.1a. The completion of this numbering according to Fu-3.2.4 is shown in Fig. 18c.

Fig. 18. Systematic numbering of (C34-C2v)[4,6]fullerene

Continued with 3.2.5. (C60-D6h)[5,6]fullerene
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