1.2 Cyclic Systems
33
cants of multiple bonds are quoted in square brackets within the bridge
name.
2
51";,,,.-:.&..---4
1,2,4,6a-Tetrahydro-1,2,4-methenocydopenta[ cd]pentalene
better:
... 1,2,4-(methanetriyl)cydo ...
4,10-Dihydro-2H-4, 1 0buta[ 1 ,3] dienocydopenta [b] anthracene
2
Other multivalent bridges are treated in the same way as the corresponding substituent groups.
6
7
(1~~~~SCH1 ~IA\/CH1a C C
H
H
3
2
1a,2,3,6,7,7a-Hexahydro-1,2,7 -[1]
ethanyl[2]ylidene-3,6-methano-1Hcyclopropa[ b ] naphthalene
better: ... -2,7,1-(ethane[1,1,2]triyl)-3,6- ...
1a,2,S,6-Tetrahydro6,2a,S- [1] propanyl
[ 3]ylidene-1H-cyclopenta [ ij] cyclopropa[a]azulene
better: ... -S,2a,6(propane[ 1,1,3]triyl)1H- ...
To name ring systems of Table 1 as bridges their name-ending ... ene is
converted into ... eno.