Name the following cycloalkanes:
SOLUTION:
Molecule 1.
1. Main chain: cycle of four (cyclobutane)
2. Numbering: starts at the substituent, the direction is indifferent.
3. Substituents: ethyl in position 1
4. Construction of the name: The substituent is named first and ends with the name of the main chain.
Ethylcyclobutane.
Molecule 2.
1. Main chain: five-membered cycle (cyclopentane)
2. Numbering: You must give the lowest locants to the substituents. By numbering as indicated the substituents have 1,1,3 locants.
3. Substituents: methyl in position 1,3 and ethyl in position 1 .
4. Construction of the name: first the substituents are named alphabetically preceded by their locants and ending in cyclopentane.
1-Ethyl-1,3-dimethtylcyclopentane
Molecule 3.
1. Main chain: six-membered cycle (cyclohexane).
2. Numbering: since there is only one substituent, the numbering begins at its carbon, the direction in which it continues is irrelevant.
3. Substituent: Isopropyl in position 1 .
4. Construction of the name: it is not necessary to indicate the position of the isopropyl in the name as it is the only substituent and it is in position 1 .
Isopropylcyclohexane
Cycloalkanes with only one substituent are numbered by giving locant 1 to the carbon of the substituent and it is not necessary to indicate this locant in the name.