Cyclohydrocarbons: Preparations

Cycloalkanes can be prepared by ring‐cyclization reactions, such as a modified Wurtz reaction or a condensation reaction. Additionally, they can be prepared from cycloalkenes and cycloalkynes (Figure  1).
 




                Figure 1


Cycloalkenes and cycloalkynes are normally prepared from cycloalkanes by ordinary alkene‐forming reactions, such as dehydration, dehalogenation, and dehydrohalogenation. Typical preparations for cyclohexene and cyclohexyne are illustrated in Figure 2 .


     


               Figure 2