PREPARATION OF ALKENES: DEHYDRATION OF ALCOHOLS

In the dehydration of alcohols, the H and OH are lost from adjacent carbons. An acid catalyst is necessary
dehydration of alcohols
Before dehydrogenation of ethane became the dominant method, ethylene was prepared by heating ethyl alcohol with sulfuric acid.
dehydration of alcohols
Other alcohols behave similarly. Secondary alcohols undergo elimination at lower temperatures than primary alcohols,
dehydration of alcohols

The Reimer-Tiemann reaction: Reaction and its Mechanism

Reimer-Tiemann Reaction Phenols on reaction with chloroform in the presence of sodium hydroxide (or potassium hydroxide) solution give hydro...