Alcohols are dehydrated with concentrated acids, such as sulfuric or phosphoric. The reaction takes place rapidly with the formation of the more substituted alkene. This is known as Saytcheff orientation. Straight chain alkenes can produce more than one product, while cyclic alkenes generally produce one product in high yield.

In this experiment an alkene (cyclohexene) will be prepared by dehydration of an alcohol (cyclohexanol) using an acid catalyst such as sulfuric acid or phosphoric acid.

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