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Cycloalkenes

Cycloalkenes: Introduction

Usually, cycloalkenes hardly differ in their chemical properties and reactive behavior from alkenes. However, because of their cyclic structure they sometimes show charateristic features which are desribed below.

Cycloalkenes are cyclic hydrocarbons with at least one C=C double bond in the ring. The smallest one, cyclpropene, has extremely high ring strain and is very reactive. Cyclopentene, cyclohexene and higher cycloalkenes show very little ring strain.

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Cyclopropene
Cyclobutene
Cyclopentene
Cyclohexene

The procedure for naming cycloalkenes follows the same rules as that for linear alkenes. Carbon atoms are numbered in such a way that an olefinic double bond is always located between carbon atoms 1 and 2. The position of the double bond is not shown in the name because a cyclic structure does not have a beginning or end.

Cyclobutene
1,3-Cyclohexadiene
4-Ethylcyclohexene, not 5-ethylcyclohexene

Nomenclature examples

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