How do you name cycloalkanes with double bonds?
Cycloalkanes with double bonds are known as cycloalkenes, and have nomenclature as a combination of cyclic molecules and alkenes.
Nomenclature is naming.
Nomenclature of cyclic or circular molecules involves counting the number of carbon atoms and giving it the appropriate root (e.g. 6
For example, a circular molecule with five carbon atoms and two double bonds between carbon numbers 1-2 and 3-4 would be
The nomenclature of alkenes is fairly straight forward.
root + where DB's are + number of DB's + ene
In the case above, cyclopenta-1,3-diene, 'penta-' is the root, '-1,3-' is where the double bonds are located, '-di-', from the Latin for two, is how many double bonds there are, and '-ene' is the suffix for an alkene.
More examples are
cycloprop-1-ene or simply cyclopropene