six possible substituted three-carbon ring structures:
1,2,3-trimethylcyclopropane,
1,1,2-trimethylcyclopropane,
1-ethyl-1-methylcyclopropane,
1-ethyl-2-methylcyclopropane,
propylcyclopropane
and
isopropylcyclopropane
These structures are drawn by drawing three carbons in a ring.
As before, the appropriate groups are attached at the appropriate carbons as numbered around the ring.
A CH3- group is drawn where methyl is found in the name, a CH3CH2- group when ethyl is found, CH3CH2CH2- for propyl and (CH3)2CH2- for isopropyl.