64
1 Parent Structures
When for certain fused heterocyclic systems application of fusion principles is absolutely impossible, replacement nomenclature comes to the
rescue.
Pyrido[2,l,6de] quinolizine
but: 9bH-9b-Silaphenalene
2-Phospha-5a-boracyclopenta[ cd] indene
(Identical) heterocycles linked by single bonds are treated like related
carbocycles:
o
00
rr
2,3' -Bifuryl
or: 2,3'-Bifuran
N
" 2'
2,7' : 2' ,7" -Terquinoline
After their components have been arranged according to the preceding
rules, the names of fused heterospirocyclic systems are assembled in the
same way as their carbocyclic counterparts (alphabetical order!).
-:? 0
o
1
~Y14 -:?
~o
Spiro [l,3-benzodioxole-2,4' -[l]benzopyran]
2'H-Dispiro[ oxirane-2,12' -naphtho[2',l' :4,5]indeno[2,l-b ]furan-8',2"[l,3]thiazine]