1.2 Cyclic Systems
25
16
Hexahelicene
New numbering
4
7
6
Indeno [2, I-a] fluorene
Benzo [a]naphtho [2,I-g]coronene
As in the following two examples the sequence of letters is pre-established
in the clockwise sense, the sequence of numbers, in order to guarantee
lowest numbers, must run counter-clockwise from the higher to the
lower number. Therefore the descriptors must read ... [2,I-a] ... and
... [2,I-g] ... and not ... [1,2-a and g] ... , respectively.
3
Cyclohepta[ a] cyclopenta [j] anthracene
Benzo[ deflindeno[ 1,2,3,4-mnop ]chrysene
9
8
25
16
Hexahelicene
New numbering
4
7
6
Indeno [2, I-a] fluorene
Benzo [a]naphtho [2,I-g]coronene
As in the following two examples the sequence of letters is pre-established
in the clockwise sense, the sequence of numbers, in order to guarantee
lowest numbers, must run counter-clockwise from the higher to the
lower number. Therefore the descriptors must read ... [2,I-a] ... and
... [2,I-g] ... and not ... [1,2-a and g] ... , respectively.
3
Cyclohepta[ a] cyclopenta [j] anthracene
Benzo[ deflindeno[ 1,2,3,4-mnop ]chrysene
9
8