1. Cycloalkanes = Six carbons = Hexane = Cyclohexane
CH 4-2: Nomenclature of cycloalkanes
Cycloalkanes
The ring is the Parent Chain - count carbons in ring: CYCLOalkane =
Six carbons = Hexane = Cyclohexane

2. Nomenclature: The “Parent Chain” is the ring
Nomenclature: The “Parent Chain” is the ring! Count the number of carbons in the ring (alkane) and add the “cyclo” prefix (cycloalkane); number substituents alphabetically; use lowest numbering arrangement.
1-chloro-3-ethylcyclohexane (NOT: 1-chloro-5-ethyl cyclohexane)
1-tert-butyl-2,4-dimethylcyclopentane

3. Nomenclature: cyclic hydrocarbons may also be substituents: “cycloalkyl”
3-cyclopropyl-4-ethyl hexane