The IUPAC name of the following compound is?
8-Methylbicyclo[4,3,0]nonane
In the given compound carbon atoms at 1 & 6 from the bridge-head.
The numbering proceeds in the bridge containing the larger number of carbon atoms, hence
and proceeds to include the carbon atoms in the other bridge
There are a total of 9 carbon atoms not counting the substituents. There is a methyl(−(CH3)) group
attached to the carbon atom 8. Between 1 and 6, there are no carbon atoms. Hence the IUPAC name is
(b) 8- Methylbicyclo[4,3,0]nonane
The bracketed number is [4,3,0] show the number of carbon atoms ( except bridge-head position 1 & 6
carbon atoms) in each bridge and they are written in decreasing order.
Note that each number within the bracket is separated by a . and not a comma.