40
1 Parent Structures
If non-identical ring systems are joined together by single or double
bonds, one is considered as parent structure and the other(s) as substituent group(s). To select the most senior parent system the following
descending order of priorities is obeyed:
a) the highest number of constituting rings,
b) the largest individual ring present,
c) the highest degree of unsaturation,
d) the list of retained trivial names (see Table 1, p. 16).
4-Cydopentyl-4' -cydopropylbi phenyl
6-(2-Naphthyl)azulene
0-0
Cyclohexylbenzene
Cyclopropylidenenecyclohexane
2-( 9-Phenanthryl)anthracene
Substituent groups derived from the ring systems treated in this chapter
are named as usual:
Biphenyl-3-yl
2,2' -Biphenylylene
Biphenyl-2,2' -diyl
1,1':2',1" -Terphenyl2,6' ,2" -triyl